Member Contributer YoshiHNS Posted August 1, 2018 Member Contributer Share Posted August 1, 2018 Looking to put together a group buy for replacement 4th gen carb vacuum pistons. These are the rubber diaphragm that moves the needle up and down. You cannot buy OEM replacements, and I'm not sure if you ever really could. If you have a torn diaphragm, or yours are just old and dry from being 20+ years old, this is for you. I met with Paul from JBM industries. Paul manufactures OEM replacement parts for many carbureted bikes, including isolator boots. Mike Norman used them on his NC35, and if they are good enough for him, they must be pretty good. He is confident in being able to make replacements. Because these diaphragms are only applicable for the 4th gen VFR, he would need a full order to cover his costs to make the initial batch. If you know other bikes that use these same diaphragms, let me know. http://jbmindustries.com/ Only the rubber diaphragm will be provided. Read through JBM's page on replacement instructions, but these will involve clipping the plastic ring off and gluing the new rubber on. He will mold in extra thickness to have the rubber replace the ring, as he has done with over parts. If you are not confident on replacing them yourself, we can work on having someone replace them for you. I will be providing a sacrificial set of parts for him to do his prototyping on if we make the orders. For Paul to go through with this, he needs a commitment of 30 sets at $80 per set of 4. This does not include shipping. He normally handles production of new molds and products at the beginning of winter, but will confirm if we get sufficient orders. Sign up, ask around, lets see if we can make this happen. I'm starting off with 3. Order list: (8/1/2018) 1. YoshiHNS 2. YoshiHNS 3. YoshiHNS 4. COS_VFR 5. SamW 6. Marsman99 7. scottbott 8. burnes45 9. LauraM 10. rangemaster 11. magpie114 12. Smack 13. Smack 14.vfrgo 15. vfrg0 16-26. Billy C 27. COS_VFR 28. kevinmacdonald 29. 30. @kgsmotorcycles @Dutchy @mcrwt644 Link to comment Share on other sites More sharing options...
Member Contributer COS_VFR Posted August 2, 2018 Member Contributer Share Posted August 2, 2018 YoshiHNS, Count me in for one (1) set. Link to comment Share on other sites More sharing options...
Member Contributer SamW Posted August 2, 2018 Member Contributer Share Posted August 2, 2018 I'll put in for a set. Link to comment Share on other sites More sharing options...
Member Contributer Marsman99 Posted August 2, 2018 Member Contributer Share Posted August 2, 2018 I'll be in for a set as well. Link to comment Share on other sites More sharing options...
Member Contributer YoshiHNS Posted August 9, 2018 Author Member Contributer Share Posted August 9, 2018 Bumpity bump. No other 4th gens want some fresh rubber in their fuel control system? Link to comment Share on other sites More sharing options...
Member Contributer scottbott Posted August 9, 2018 Member Contributer Share Posted August 9, 2018 maybe interested but wondering about postage to the UK, on the TV this morning they said the UK £ was worth 1.28 US dollars, thats a shit exchange if you just off to the states for a holiday Link to comment Share on other sites More sharing options...
Member Contributer burnes45 Posted August 9, 2018 Member Contributer Share Posted August 9, 2018 I'm in! Bought a set of carbs last year for parts but the rubber parts wont last forever. Owning 20 plus year old motorcycles you have to plan ahead. Thanks for thinking ahead and setting this up. Hope we get enough orders to make this happen. Link to comment Share on other sites More sharing options...
Member Contributer Cogswell Posted August 10, 2018 Member Contributer Share Posted August 10, 2018 I no longer have a 4th gen, but if I still did I'd be all over this one. Nice job! Link to comment Share on other sites More sharing options...
LauraM Posted August 30, 2018 Share Posted August 30, 2018 If you haven’t already placed the order, I’d like a set. Don’t need them yet, but know I will sooner or later, and I might not get another chance. Link to comment Share on other sites More sharing options...
Member Contributer Dutchy Posted September 2, 2018 Member Contributer Share Posted September 2, 2018 Missed this post..... I no longer have redslut, but have cross posted this on the dutch VFR forum. Link to comment Share on other sites More sharing options...
Member Contributer YoshiHNS Posted September 10, 2018 Author Member Contributer Share Posted September 10, 2018 Last bump. Setting Oct 1st as the deadline. Link to comment Share on other sites More sharing options...
Member Contributer rangemaster Posted September 11, 2018 Member Contributer Share Posted September 11, 2018 Yoshi, add me to the list for 1 set. Many thanks. Link to comment Share on other sites More sharing options...
Member Contributer magpie114 Posted September 11, 2018 Member Contributer Share Posted September 11, 2018 Can you add me for a set too please? Thanks Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Smack Posted September 20, 2018 Share Posted September 20, 2018 I would like 2 sets, please. Anyone got an electronic manual for these Keihin carburetors that discusses jet sizes etc.? I have the '96 shop manual. Any idea if these diaphragms are the same size as used in the '86 750? Thanks for putting this idea together ! Link to comment Share on other sites More sharing options...
Member Contributer YoshiHNS Posted September 20, 2018 Author Member Contributer Share Posted September 20, 2018 AFAIK, they are not the same. These pistons are only used in the 4th gen VFR. That is by going off of part numbers in the parts catalog. He might have one that fits. that might be the same as the VF700C, which he has listed. K-68. Send an email, pictures, and dimensions, and he should be able to let you know. http://jbmindustries.com/Dimensions.html Link to comment Share on other sites More sharing options...
vfrgo Posted October 22, 2018 Share Posted October 22, 2018 Hey, I can be in for a couple sets.. I'm due for a carb rebuild and will need these, i'm sure. keep me posted on what happens! Link to comment Share on other sites More sharing options...
Member Contributer YoshiHNS Posted October 22, 2018 Author Member Contributer Share Posted October 22, 2018 Update. Been discussing with Billy C (V4 carb rebuilder). He is in for 10 sets if he can be convinced that the replacements will work. We've been looking at different things, and think we've found that CBR900RR and CBR600F3 (among others) share the same diaphragm. We are going to see how close F3 pistons are to the VFR ones. If they are similar, this opens up a bigger market for JBM industries to serve. We are just on the borderline of making the 30 minimum order, so this might be a reality after all! Link to comment Share on other sites More sharing options...
Member Contributer burnes45 Posted October 22, 2018 Member Contributer Share Posted October 22, 2018 Good news. Thanks for staying on this for us. Link to comment Share on other sites More sharing options...
Member Contributer COS_VFR Posted October 22, 2018 Member Contributer Share Posted October 22, 2018 Yoshi, I am currently in for 1, increase it to 2. Link to comment Share on other sites More sharing options...
Member Contributer COS_VFR Posted October 24, 2018 Member Contributer Share Posted October 24, 2018 OI don't know if this helps, but looking at Partzilla, part number 16111-MZ1-000 is the vacuum, pistion for the '94-'97 VFR750F and '94-'95 CB1000A. Link to comment Share on other sites More sharing options...
Member Contributer Lannyl81 Posted November 5, 2018 Member Contributer Share Posted November 5, 2018 Just saw this....been really busy....what is the status of this? I would be in for a set. Link to comment Share on other sites More sharing options...
Member Contributer YoshiHNS Posted November 8, 2018 Author Member Contributer Share Posted November 8, 2018 Status is Billy C found that the CBR piston assembly matches with the VFR one. That's about it. I'm working extra this week and hope to get back with him on getting one of this destroyed diaphragms into the hands of Paul, so he can give a final ya/nae on making them and how he would make them. Pretty sure with opening the group buy to CBR600, 900, 1000, we would have no problem breaking 30. We're only a few short now anyways. Link to comment Share on other sites More sharing options...
nezhac Posted February 27, 2019 Share Posted February 27, 2019 What's the status on this? I'd be interested in a set Link to comment Share on other sites More sharing options...
Member Contributer Lannyl81 Posted August 29, 2019 Member Contributer Share Posted August 29, 2019 Whatever became of this? Link to comment Share on other sites More sharing options...
Member Contributer YoshiHNS Posted October 7, 2019 Author Member Contributer Share Posted October 7, 2019 I contacted the guy a long time ago now and mentioned the order numbers I had and that they would also fit these other bikes, increasing the order size, and never heard back. Link to comment Share on other sites More sharing options...
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