Simple Comprehensive Clean (CC) of an Amal. New hoses and gasket set included.
Part restoration
Restoration and a pair of beautiful Bings.
Restoration
Concours: £10k Laverda SFC restsoration by Slaters, carburettors by JRS
Concours
Part restroration
Part restoration: replating of steelwork, light polishing of bowls, moirror polsihing of tops and polished stainless steel cap head screws and lockwashers throughout.
Less extensive part Restoration. Note the new JRS central fuel T piece.
Concours: GT550 Suzuki complete with new breather and overflow lines.
Kawasaki KH 250. Concours
KH 250: Concours
Mikuni VM28 from a GS1000S. Comprehensive overhaul and Component Restoration which included replated steelwork, polished tops and outer bowl surfaces, re engineered bodies and bowls. New JRS fuel T piece and matching links between carbs 1 and 2, 3 and 4. All tested and ready for fitting.
Mirror polished top covers and linished, polished and replated steelwork.
Mounting frame re-engineered and facets of the frame mirror polished.
These Mikunis have pilot fuel and air screws. With care, these instruments can be set up to suit many non standard induction and exhaust setups. Notes supplied with the completed work give guidance on carburettor related matters.
A handsome set of overhauled and restored carburettors. Tested before return to the customer. JRS - tested quality....BUT......
Same set as previous illustrations: redone as customer disappointed with the finish on the carburettor bodies. In fact these castings are not the best and whilst the appearance is a little brighter, they will never "shine".
Despite my best endeavours to be clear and explicit about the extent of work and the processes used, there appears to have been a misunderstanding in this case. Thus the work was redone. This has never happened before.
Re-engineered bodies and floatbowls bowls with outside faces on 1 and 4 polished. Similar treatment for mounting frame, with selected facets polished.
Handome set. Note new fuel T piece for Suzuki VM series applications. The location of the idle speed adjuster requires a modification to the usual JRS T piece. T pieces are available for DIY fitting, or can be fitted for you for a small fee. Fitting is free if carburettors are being overhauled at JRS. Customer is delighted and so am I!!
Suzuki X7 carburettors after Comprehensive Overhaul. These were an excellent set of unrestored carburettors, non functioning when received at the workshops and perfect on return, complete with new hoses supplied by JRS. Tested quality.
Kawasaki Z1000A carburettors after Comprehensive Overhaul. T pieces did not need replacement and again, a lovely set of original carburettors - now in excellent order. Tested quality.
A beautiful set of carburettors from a Honda 400/4. Original in every respect and still carrying evidence of the original plating. Non functioning on receipt, but the Comprehensive Overhaul, which included new O rings where required has resolved the problems. Note no damage from acids or any aggresive chemicals. Original finishes preserved by use of industrial quality ultrasonics, engineering skills and years of experience. JRS - tested quality.
Set of Keihins from a Honda CBX. At JRS for Comprehensive Overhaul, the assembly had problems with binding choke shafts and leaking accelerator pump. Dismantled, cleaned and carefully rebuilt with new O rings to fuel links, pump links etc and old butchered fixings replaced. There is a correct build order for these, which must be followed.
Completed assembly checked for fuel tightness and pump operation. JRS - tested quality.
RD400E 1978 carburettors in for Comprehensive Clean/Overhaul. Returned complete and tested with new breather,overflow/drain hoses.
CB72 carburettors after CO and PR. Shine is due to recent application of ACF presevation fluid.
Suzuki GT750 carburettors, as received after 10 year lay up.
CO complete and all operational again.
Phil Denton Engineering sent these Honda CB 125SS carburettors and fuel tap for overhaul and restoration.
Completed fuel tap: See the Phil Denton Engineering stand at Stafford in October 2008 for a look at the carburettors. JRS - tested quality.
GS1000G carburettors in for Comprehensive Overhaul.
Another set of early Keihins from a CB72. As well as the usual problems, these had black paint in the venturi, the air bleeds, the chokes and the slides, so comprehensively ffouled up. The usual oxidation issue as well.
Same set, but work complete and carburettors tested. In certain cases it is possible to "recover" heavily oxidised surfaces, but often it is not and then you have residual pitting as is evident on the choke operating arm. However, still 100% improvement to most eyes.
The next 4 images are of a set of carburettors from an early 70's 750 Honda at JRS for CO. Float bowl shows extent of contamination - complete assembly is locked solid.
So, float bowls are poor, floats and pins locked up, as are needles and atomisers. Someones's past efforts at pin removal show what can happen:- fortunate indeed that the float post did not break !!
CO complete and assembly fuel tested. All original components (except 2 floats and 4 float pins) retained, so parts cost minimised. This is important because OE parts are expensive and can also be difficult to source. There is a significant difference in the quality of OE parts and kits that are widely available such as those manufactured by Keyster....
....so for this set of carburettors, Keyster kits would have cost about £80, yet JRS commercial ultrasonics cleaned all of the components properly. The O rings that were required would not have been in a Keyster kit !!
Z750 carburettors at JRS for CO and PR. Other issues included a seized idle mixture screw that had to be milled out, as well as bent idle speed adjuster ( green cap). Customer requested polished tops and bowls to carburettors 1 and 4, together with stainless cap head screws. New O rings supplied to float valve bodies and fuel links included in costs,( No overhaul kits required!!)
Finished work. JRS - tested quality.
Note original steelwork in good condition and the costs of replating hardly warranted.
Carburettor tourism!! Brought by customer from Australia and left with JRS for CO whilst they holidayed in the UK. Carburettors in this state do not work well!!!!
Goldwing carburettors in for CO.
Heavily contaminated with fuel residues. Goldwing carburettors can be very difficult.
Early carburettors can be very tricky but success rate at JRS is high and this is achieved without hacking the internals about, as some people advocate..
Parts required, including a new pump diaphram. Huge costs involved in virtually all carburettor spares. It makes sense NOT to buy overhaul kits until you know what, if anything, you actually need.
Broken castings do not help. This is the new 6mm choke pivot which has been fabricated and welded. It replaces the original that had broken off at some time in the bike's history. Repairs of this sort are not for the feint hearted- alloy is a dificult material to weld and thicknesses are often not great. Every chance for the novice to burn holes!!
CO complete. Choke pivot point is under the black plastic arm, lower right hand carburettor. Repair is virtually invisible. As is often the case, what appears to be a relatively straightforward piece of work can quickly turn into a series of problems. JRS - tested quality carburettor services.
1978 CB500T carburettors at JRS for CO.
Work complete.
Older carburettor spares are getting difficult to source. The air cut off valve that is under the circular cover is an example of a part no longer supplied by Mr. Honda. The old one is just about useable and the customer has been advised to search out a replacement.
A nice example of contamination caused by fuel residues. There are drain screw recesses in the base of each of these bowls - difficult to see because they are full !!
These are the same carburettors, after CO. Fuel tested and very presentable. JRS - tested quality.
Kawasaki Z carburettors at JRS for CO &PR. Non functioning although look OK.
Work complete. Problems identified and the completed assembly tested. An example of where the PR element was contained to the use of stanless steel cap head screws and lockwashers. Original plating in very good condition and no other work was considered necessary. JRS - tested quality.
Yet another set of Keihins from a Honda 400/4 at JRS for CO and PR. For PR, customer chose to have all steelwork replated and the tops and bowls of carbs 1 and 4 polished. The JRS Gallery on REPLATING STEELWORK featured the preparation of this steelwork.
Pair of Mikunis from a 250LC, at JRS for CO. Very nice original finish. Returned with overflow pipes and a link pipe, in case of need. This can be cut to size by the customer.
Yamaha XT600 carburettor assembly at JRS for CO.
Work complete and fuel tested. JRS: tested quality.
Set of Mikunis from a Suzuki GS650GZ at JRS for CO and PR. The intended PR spec is very high!! But are the carburettors worthy? From this pic, these do not look too bad, but as the Notes on Carburettor buying on this website infer, a close look is mandatory. Just for starters, we have one seized idle mixture screw to machine out and replace.
Alarm bells are ringing!!! Corrosion is quite evident from 9 oclock to 2 oclock on the butterfly and the body.
With the butterfly open, the ring of corrosion is quite evident. IF this is deep into the carburettor body, this carburettor is useless. If it is not more than surface discolouration, not so bad. Ideally prefect contact between butterfly and body is a requirement. Anything else here to be concerned about?
The floatbowl of the same carburettor and its neighbour on the left (carb 4 ) to compare. No.4 is fine, No 3 looks seriously bad. The bung is the pilot gallery is loose becase metal had been eroded away. Better news is that the peg that locates the emulsion tube is still in place and the pilot jet will come out. Whether the float pin will come out and whether corrosion around the float valve body will prevent an effective seal is anybody's guess. Thing is, to complete the work or not? Another carburettor would be the better way to go and that's what the customer will be told. JRS - trusted quality workmanship.
What a mess!! Main jet removed with brass washer beneath to reveal head of emulsion tube.
Honda 650 carburettors after CO.......
........ at the end of which, of course the work is fuel tested prior to despatch. However, 6 months later, customer gets around to fitting the carburettors and advises JRS of a leaking fuel T piece. JRS asks for return of the work and the O rings were replaced and the carburettors returned the same day. No charge. JRS: tested quality engineering and a professional, reliable service.
Pair of carburettors from a 1986 V500E Honda at JRS for CO. Slides are seized and so are the throttle shafts!! ----- Happy Days.
Pair of Mikuni Solex carburettors from a Yamaha TX 750. Not a straightforward job - 3 seized jets needed milling out and the remains can be seen. In addition the top covers were distorted and this needed to be removed before adequate slide operation was possible. JRS - an engineering approach to carburettor overhaul and restoration.
Trade work: CB500/4 carburettors received for CO. Duly returned to trade customer who returned the work to JRS because they could not get the machine to run properly- no idle and erratic performance. Assembly rechecked:- adjusting screws all over the place indicating that the proceedure used to synchronise the carburettors and set the idle mixture was entirely wrong. Work rechecked and returned with a note advising trade customer accordingly. JRS - courtesy in the face of adversity!!
More work from Phil Denton Engineering, one of the UK's foremost restorers of Japanese motorcycles. This time a set of Keihins from an early CB750, at JRS for restoration. Note wrong/broken main spring, but otherwise worthy candidates for Denton/JRS expertise.
Same set. Operational cleaning complete. Yet to come is the work required to transorm these into....................
......these. Cleaning, linishing, polishing, replating, re-engineering all completed. Very careful rebuild of each carburettor with correct float heights and idle mix screw setting, the carburettors are ready for trial assembly. New rubber boots ordered.......
....and here they are, "trial" assembly completed. When new boots are here, they can be completed and fuel tested.....
..and here they are. Floats set at 26mm and fuel tested. One obvious mistake here which will be corrected before delivery to Phil Denton Engineering.
Yet more CBX carburettors in for CO. Customer has polished tops and bowls and also has had the steelwork chrome plated. Chrome plating these components is perhaps not the best idea in the world - any change in their profile can make accurate reassembly very difficult and binding shafts get to be a real possibility.
This is what a set of CBX carburettors reduces to. Dismantled and ready for ultrasonics.
2 restored Honda 50SS Keihin carburettors, again for Phil Denton Engineering.
Set of poor condition Keihins from a USA spec 750 Kawasaki at JRS for CO. Note wrong bowl on carb2, but rechromed tops to all 4 carburettors. Lots of rust is a sure indicator of neglect and more problems but......
... here is the completed work. The further problems are positioned under the completed work - 3 milled out idle mixture screws. This work is frequently required and despite what others may say, there is only one way of removing these and milling IS the way. However, it is very easy to get this wrong and ruin a set of carburettors so be warned. My customer was advised by a carburettor spares firm that they had "extractors" which always worked: no such tools exist. Unscupulous firms will promise anything.
1100 Goldwing carburettors after CO.
CB750 Honda carburettors in for CO and PR. The black spots are paint residue. Partially dismantled in this pic, this assembly has seen better days. However, internally, things look very much better. Part restoration schedule agreed and these will look very different!!
Here is the completed work. These carburettors had been unused for 10 years, during which they have suffered. Original chromed top caps have been stripped of plating and polished. All steelwork other than the operating shaft has been beadblasted, linished, polished and replated in BZP. All carburettor fixings are polished stailess steel cap screws and lockwashers, Outside of bowls 1 and 4 have been polished.
Nothing skimped here.
Bowl overflow pipes had corrroded and have been replaced. Fuel tested and reeturned by insured carrier. JRS: an engineering approach to carburettor restoration - tested quality.
The contrast of the re-engineered body with the polished bowl sides and tops, the polished facets on the mounting, together with the replated steelwork and polished stainless steel fixings is generally regarded as one of the best finishes available. Maintenaance is not too onerous either.
Pair of flat slide TM series Mikunis, complete with tacky Araldited bellmouths, at JRS for CO and PR. Amongst other projects, Phil Denton Engineering is restoring a Honda RS 750 flat tracker and JRS is restoring the carburettors for PDE.
Work completed. Compare this image with the one before and you have here the essence of what separates JRS from the rest. Ultrasonics, re-engineering, metal polishing, replated fixings and the Araldite surplus has been seemlessly removed. JRS - tested quality service and workmanship. What's an RS 750 Honda? Well.....
..... this is what we are talking about. Air cooled, V twin, 750cc, OHC and 4 valves per cylinder. Flat track racing machine from the early 1980's built by Honda to challenge the dominance of HD in the USA. Phil Denton Engineering will be completing their restoration of a similar machine at the Stafford Show in Oct 2009
Lots of demand for the JRS fuel T pieces and links for VM series Mikuni carburettors. The olde parts are at the top and the various versions required for virtually all Z series Kawasakis and GS Suzukis from the 1970's are illustrated below. Full details on the JRS website.
Set of CB750 F Supersport carburettors in for CO. Externally very good condition under the grime with plenty of original plating still in good order. Internally......
... shambles. Thaat's fuel residue in all its stinking glory. Customer gave it his best shot and decided enough was enough. This bike had not been moved for 10 years
Mikuni from a Beamish Suzuki atJRS for CO and PR
Re-plating in BZP, re-engineering, polishing etc attend to the exterior improvement. Internally, ultrasonics have taken care of everything and a careful build and test ensures all is well.
Set of early Keihins from a 1978 1000 Goldwing. Bought as a serviced set, ready for use. At JRS for CO because they were not as described. In fact, other than comprehensive internal fouling....
... the top cover inserts are leaking air, internally all O rings are perished and useless and floats are damaged. These are early Keihins and the main and pilot jets are held in place by a steel clip that is braced off the base of the floatbowl. In the pic above, after the cleaning element has been completed, all of the missing screws indicate where the threads in the bodies have stripped and .......
the non standard fixings are these things which have been used to hold the body and bowls together. Shambolic. So I intend to " Re-coil" all threads to take the original 4mm fixings and where this is no longer possible the 4mm screws have to be upped to 5mm and the appropriate engineering completed. As you can see, there is not a lot of spare space!! JRS - a tested engineering approach to carburettor overhaul and restoration.
Here is the completed work. 16 Re-coils, cap head screws and lockwashers.
On a happier note, a set of 33mm VM series Mikuni smoothbores, at JRS for CO and PR. Below is a set of 28mm standard VM series Mikunis, after CO and PR. The 33mm carburettors are intended for a modified Suzuki Katana that is one of Classic Bikes projects. If you look carefully, there is not much that is common to both sets..
... other than the general position of the cold start mechs, but even here, things are different. JRS has been asked to provide the CO and PR and also write the accompanying article that will be published in some form in Classic Bike magazine. The JRS original article will appear here, in due course.
Smoothbores complete.
One of a pair of Mikunis from a 350 RD YPVS. These had been cleaned by a carburettor cleaning outfit, but the bike would not run. Here we see the emulsion tube from one of the carburettors. The crap that surrounds the tube is a mixture of oxidation and blasting media. The cleanliness of these tubes is critical to the performance of the machine and in this condition, they are absolutely useless.
Here the tube is out and this is it in all its glory. Truthfully, just as extracted from the carburettor. In addition to this, the internal build was hopeless.
This is the same emulsion tube, but as it should be. There is a series of holes along the length of the tube and these substantially influence the fuelling of the engine throughout its rev range.
Here are the completed pair. Externally they look little different to when they arrived at JRS. Before they would not have worked and now they will. Cleaning a set of carburettors is NOT the same as overhauling them, so do not expect the same results. However cleaning needs to be done effectively! It is not a matter of equipment available, it IS more a matter of competence. Can you judge these matters by external appearances alone? Are you going to take your carburettors apart to check that any work done has been done properly? Probably not and you should not have to. Just make sure that your carburettor work is completed by someone with the experience and inclination to do it thoroughly and to stated published standards. Why take chances with your engine and why waste your money?
Less usual carburettor form: so called fixed jet carburettor from an HD. Although marked Harley Davidson it is a Keihin. Pic shows choke lever to the left and throttle butterfly/accelerator pump operation to the right. At JRS for CO....
..and here is the completed work. Internal cleanliness matters on all carburettors but is even more critical on fixed jet/fixed venturi carburettors. Float height set at `15mm, idle screw 1.5 turns out. Fuel tested and pump operation confirmed. JRS - an engineering approach to carburettor services.
4 carburettors at JRS for CO and PR. As well as completing the work, various parts have to be sourced, including the correct quadrants, cable mounts and fuel inlets. Customer requires a photographic record of the work for his restoration records. No problem at all.
Here are all the constituent parts of one of the carburettors, awaiting reassembly. External steelwork has been linished, polished and replated in BZP, tops and bowls have been corrected and polished, external brass lightly polished and the body re-emgineered. Ultrasonic cleaning before and after, of course.
Work completed, some spares as well as a ........
..pretty pair of restored fuel taps. JRS - an engineering approach to carburettor overhaul and restoration.
Pair of Mikunis from a 750 Kawasaki twin, at JRS for CO.
Work complete and fuel tested.
Pair of Keihins from a Honda CX500 twin at JRS for CO.
Completed and tested work. Note that generally, spray paint will not withstand commercial quality ultrasonics. However, repainting will not take the owner more than a 20 minutes. Replating is, of course the longterm answer, but we cannot always have what we would like and expense has to be a consideration and that's understood at JRS.
Another set of keihins from a Honda 400/4, in for CO.
Complete and fuel tested. Customer just wanted the choke lever replated and this was completed and fitted, foc.
Pair of R100/7 Bings at JRS for CO.
Complete. Full of fuel residues and collapsed diaphrams. Rebuilt using new parts, as required. Tested and returned with usual letter, via insured carrier.
A bank of XJ650Turbo Mikuni carburettors at JRS for CO. The single carburettor is to be built into the final bank in place of the 3rd from the left, which has damaged internals. Carburettors were heavily contaminated with residues are otherwise relatively unworn.
CO complete and asssembly fuel tested.
Pair of Suzuki T500 carburettors in for CO.
Complete.
This is an example of when things get difficult. Customer says that these came from a running bike and does not understand my doubts! This is 1 of 4 all in a similar condition for a Suzuki model not imported into UK. Thus they are special in that respect. Additional time will be needed to free all of the components which are locked/seized in place and even if they are freeable, the extent of internal corrosion is at present unknown and could be sufficient to compromise effective running of the engine, should we get as far as completion. Time costs money, so decisions have to be made as to whether to "invest" in these instruments, or seek others.
JRS operates on a fixed price basis and this in turn is based on the time taken to complete the "average" piece of work. This is not an average carburettor as pics on this Gallery will testify. So additional time will be required and if the custsomer does not want to pay this then I am very happy to return this shambles and the others like it and get on with the next job. I am a reasonable bloke - all I ask is that customers are also reasonable. Happily 99% of you are just that.
So, after a lot of work and concern, this is the result. Fuel tested this pair, once properly set up, should work. However, how the corrosion will affect them is a big unknown. Getting the needlejet out required the manufacture of special tooling ; thread 12x28UNF.
This is more reclamation work that restoration work. Simply too time concerning and the prospect of terminal damage, despsite best intentions and efforts remain. The other pair?
They have been in release fluid of weeks!! Customer voices concern over time taken so far, so I am sending them back with the completed pair, for someone else to play with.
Come on, people!! be fair!!
Good news travels,in this case to Cyprus. These are a pair of Keihin carburettors from a very early CB160 Honda, sent to JRS, for CO and PR. They come with manifolds attached.
This is the LH unit. Incidentally small carburettors do not cost less than bigger ones - the same degree of care, time and attention is devoted to all.
Here is the RH instrument.
The completed pair.
This also comes from the same country - a small carburettor from a Z 50cc Kawasaki, at JRS for CO and PR. Again, essentially it is in decent order and an ideal candidate for CO and PR.
Nothing broken or seized but still fouled up with residues and corossion.
The completed pair and the Kawasaki Z50 instrument, ready for repacking and the return journey to sunnier climes!!
CO and PR complete on a Keihin PE carburettor from a Honda C114. This carburettor was seized and a solid mass of fuel residues on arrival : alas, some components were permanently damaged and replacements will be difficult to source so some improvisation will be needed..
1981 GS1000 carburettors in for CO and PR.
Work complete. Problems all associated with poor maintenance and a damaged diaphram. PR options limited to polishing tops and bowls of carbs 1 and 4 .......
.. and re-engineering the outer faces of the bodies of 1 and 4, togther with 8 better fixings to tops and bowls.
Yamaha 1200 Mikuni carburettors for CO. As well as the overhaul work, the 2 additional carburettors are to be built into the completed assembly in place of carbs 1 and 2, both of which carry irreversible damage.
All done.
Here is challenge that JRS can meet. Mikunis from a Z series Kawasaki, black paint and non functioning. Customer wants "the works" as far as CO and PR is concerned.
"Mucky", as my grand daughter would say!!
The same set of Z series Mikuni carburettors, complete. CO and PR, with top spec, including re-plating, re-engineering, metal polishing and new T pieces.
Nothing skimped.
Set of early 750 Honda Keihins in for CO.
More Mikunis from a Jersey based Z1A at JRS for CO.
Very busy and gallery pics have got behind!! Must be warmer weather, when thoughts turn to biking!!
GS 550 carburettors for CO
All done and tested.
Pair of Mikunis from a Kawasaki V twin
CO completed and tested. They neede new float bowl gaskets and thet's about it. Very nice original finish preserved. JRS - engineering approach to carburettor overhaul and restoration.
3 Mikunis from a Suzuki GT550 triple. Forgot to take a pic of the completed work!!!!
Pair of Keihins from a 250 Honda.
4 Keihins for a CB650 Honda
3 Mikunis from a 1975 Kawasaki H2B 750 triple in for CO and PR. Fuel tap as well,
CO&PR complete. Customer just asked for replated steelwork together with overflow hoses. A very nice set of 3 unmolested carburettors.
Honda 550/4. Keihins in for CO.
Old Mikuni from a Suzuki trail bike. CO and PR requested. However, in addition to the usual work, components had to be manufactured or modified to suit. Original condition evident by the extent of corrosion of cable supports but these wont be immediately obvious when the carburettor is on the bike.
KZ650 Kawasaki carbs after CO. Replaced mangled screws below.
Good news apreads ever wider: All the way from California, 3 Mikunis from an early 750 Suzuki at JRS for CO and PR. One choke plunger seized in the body with a bit of cable attached.
Dismantled and after ultrasonics. These images will go to the US customer and he can then decide on what further services he wants.
Staining evident on three bodies but careful masking and gentle beadblasing will remove this and the obvious oxidation. This process, as completed at JRS gives superb results and is infinitely manageable, which cannot be said for vapour blasting on smaller, masked components. Ultrasonics again afterwards, of course.
Bowls and tops all need the same attention. All steelwork will be linished, polished and replated in BZP. the end results will be quite impressive.
Completed work. Images off to the USA for comment.
So, steelwork linished, polished and replated in BZP. Certain of the brass parts were also plated originally and these have been replated and the rest polished. Tops lightly polished after improving, bodies and bowls re-engineered. The sides of the bowls and the fronts have also been polished. The pic before this shows the choke plunger that had seized in the body- drilled, tapped and withdrawn without damage.
This is one of the three.
CB500T carburettors after CO.
Another set of carburettors for a GT750, a later model this time. In for CO and PR. Partly dismantled, as you can see, the customer has already nicely polished bowls and tops. Following pics sent to customer for decisions on the level of restoration required.
Appearance of bodies can be judged with supplied polished parts attached with replated fixings. Issues revolve around whether the bodies arwe bright enough and the extent of the replated steelwork, particularly that associated with the throttle shafts.
My choice would be to extract the shafts in carbs 1 and 3 and replate the associated steelwork. Re-engineer bodies 1 and 3 as well. We will see what my customer decides upon.
Steelwork, after linishing, polishing and off to the plater next.
All the shaft components, again after preparation at JRS. Off to the plater for BZP.
And that's what my customer decided to have. Here is the completed and tested assembly. Chromed top plates, BZP to all exterior steelwork, re-engineered bodies on the outer carburettors. Ultrasonics before and afterwards, of course.
The other "darker" bank were purchased for spares. Floats and other parts were needed to make the restored assembly fully functional. This pic gives a very fair view of the difference pre (top set) and post (lower) restoration.
Nothing skimped here: all shaft steelwork linished, polished and replated. This work has been completed for a customer, intent on building a concours winner. JRS, where the best is available in workmanship and service.
Honda CX500. In for CO and .....
..after work completed.
More Honda work after CO.
Now this makes a change: a set of early "original" 70's Keihin smoothbores all the way from Gran Canaria, to JRS for CO and PR. Apparently unused for 30 years!! This job will require ultrasonics; manufacture: engineering: re-engineering of castings; metal polishing; linishing, polishing and replating of steelwork and a lot of time before I can produce the finish that these are worthy of. Greatly sought after set of carburettors in the mid 70's and prized now.
Top view: oxidation evident here...
..and here....
...and here.
These are the constituent parts of No. 1 carburettor. Internal condition is probably acceptable, but the float has seen better days. Extremely heavy fuel deposits evident. A condition assessment can be made after the ultrasonics have done their work.
This is what No 1 carburettor looks like after ultrasonics: internally excellent but much work to be done on the external appearance. Before that can start, Nos 2 and 3 need time on the Bridgeport to remove seized jets and screws. The new cap head screw shows the contrast as does the finish on the needle roller bearing which is just visible at top right of the body.
Body No.2 on the Bridgeport in order to machine out the damaged idle air screws.
Milling in progress and plenty of brass evidence.
We will need new idle air screws and here the taper on an original airscrew is being established before cutting 4 new ones. Customer kindly donated 4 screws for modification.
Cutting in progress and ........
..here are the four "new" airscrews and the remains of the 2 that have been cut out of bodies 2 and 3. Note tapered ends intact, as are the springs. 6mm x 0.75 tap to clear the bodies and all is well, so far. The original screw is lower right of the pic. New ones look bigger? They are not, though!!
So, machining and manufacture over and the 4 bodies, ultrasonic cleaned and tested are ready for improvement.
So, this pic and the next show before and after re-engineering. Original, untreated components in the middle and improved to the left and right. Daylight views and no flash photography. The top right bowl has a polished side. Customer asked to confirm choice of finish. All castings have suffered through oxidation.
Same subject, different view. I expect the carburettor bodies to respond to re-engineering in the same way. The polished bowl ends are available if required. Feedback from my customer obtained and no polishing required.
Polished or not? No thanks.
"Before" on the left and "after, on the right. Next step is to linish, polish and replate all of the steelwork and then we can start thinking about reassembly.
Pair of Keihins from a KZ400 Kawasaki sent to JRS for CO but....
.....there is little point when the float posts are held in place like this. Customer advised accordingly and work returned. Customers do not want to waste their money and I do not want to waste my time and the excellent reputation that JRS enjoys for the sake of £170.
Completed. A set of Keihins from a 750 Honda at JRS for CO.
VM38SS Mikuni from an 80's DR600S at JRS for CO.
Side view.
Again.
Completed work which includes replacement O ring to float valve body and some drain hose. External appearance alos greatly improved. Fuel and pump tested before return.
