Keihn P75A 0024, 32mm carb, Main 140, Pilot 40
The 32mm Keihn carb used on KLs is a rare animal. I spent a day in a salvage yard looking for just one and came out only with dirty hands. Absolutely keep your carb. If you are having carb problems, your options are limited. If your carb is non-functional do the steps below. If it’s really toast, buy a used one and do these steps:
- Have a local shop put them in a sonic cleaner. They’ll come out clean, inside and out. Really this is a basic first step.
- Order rebuild kits offered on-line if your internal parts are beyond help (save them if you can).
- If you are having real issues, send the carb off to Spyder Cycle Works, Salem, UT. A fellow named LE Wright runs a vintage carb rebuilding service. Contact him at 801-609-1198, or email
This email address is being protected from spambots. You need JavaScript enabled to view it. , or message m.me/spidercyclewerks.
I contacted Sudco to see if they had a round slide Mikuni replacement. Basically no. You’d have to buy a different throttle assembly and Mikunis have a wider mouth and probably would not fit the KL air box. You do want to keep the air box for max engine performance and as a dirt/dust block.
A little note: The flapper throttle valve also has a little flapper valve for low speed tuning. The whole throttle valve was not on my bike when I bought it. That dual-valve you can find in a junk yard because a few other Keihns used them.
Maybe my info is out-of-date and there is a fit-able aftermarket carb. You may know more than me. Contact me at 952-607-6063 or
After mangling the job on my bike I got the correct lower tree mounting pattern. Here’s a sample of a 1978 fender. Make a template on the new fender and drill away.
Across 68mm. Front/back 42mm.
Contact me at 952-607-6063 or