HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
bochnak

Throttle / butterfly shaft vacuum leak

1 post in this topic

I'm working on a 92' honda cb750 nighthawk with keihin CVK carbs.

I found a vacuum leak on 1-2 & 3-4 throttle shafts.

I found the felt seals and replaced them:

http://www.motorcyclecarbs.com/FELT_CV_BUTTERFLY_SHAFT_SEAL__P11503C680.cfm

The 1-2 leak disappeared, however the 3-4 is still there.

First off, the throttle shaft rides directly on carb body, no bronze bushings what so ever. Also, I think these felt seals are a joke. The body & shafts seems tight with no major play.

I'll try to open the idle mix screws on problem carb one turn.

I also may try to ditch the felt seal and put in some o-rings.

Anyone else have this issue?

Thanks,

Matt

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0