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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. 29. 30. @kgsmotorcycles @Dutchy @mcrwt644
While perusing the Durbahn site looking at all the shiney things that you couldn't buy if you sold half your organs, I saw their Keihin FCR carbs for the RC30. And well, that got me thinking. Carbs aren't that complicated. Surely less complicated to make a rack for carbs than convert to FI (as their NC30). There's a lot of information to go over, so who wants to help? For the point of the discussion, let's assume that there are no bottlenecks in the system, and ignore jet and pilot settings. I just want to see what it would take to get a set of flat slide carbs on. Not that I'm planning on starting another project any time soon. Durbahn advertise a 7hp gain just from switching the carbs from the OEM to the Keihin FCR39s for the RC30. What is giving the extra power? Jetting can always be adjusted and tuned, so it has to be something more than that. What are the sizes on the intakes for the 3rd and 4th gen. I think they are different. 3g=39mm. 4g-41mm? I can always check my 96 carbs for the size, but not the 3rd gen. What are they on the RC30? Does Keihin make an individual carb unit so that 4 units could be assembled and mounted in the orientation needed for the VFR?