I have an 86 K5 that seems to keeps wanting to go when in higher rpms. The bike is somewhat of a project at the moment and has no brakes, so the engine not wanting to stop is a bit scary lol. When I got the bike it had no carb needle. The carb is a Mikuni VM40SS as far as I know, what came stock. The stock needle is a 6j6-2 which I have learned no longer exists anywhere on this planet. I had purchased a slide, needle, and cable off of ebay, which was advertised as compatible with an 86. I think it was from a 38mm carb, the slide was too small. I took the needle out and used it anyways. Pretty certain its too small for the carb, and my question is will the needle being the wrong size cause the engine to rev like that? I've read other posts of people with the same issue, and I've repaired cracks in the air box duct with silicone, and put new Boysen reeds in. I cannot find ANYTHING about the VM40SS. Any list of Mikuni carbs excludes this one, for whatever reason. I've contacted Mikuni and they pointed me to a a guy that makes vintage needles but they gave me no specs for the thing.
Can I put a different carb on this bike and what one is recommended?
I have a problem with the overflow also. Not sure if the float level is wrong, or the float valve is bad. The valve was making a clicking noise the last time I rebuilt the carb.
Any help is greatly appreciated. Thanks!