bytor
Well-Known Member
Long story short, I took by TB to a local carb shop about 7 months ago to have the throttle shaft bushings installed. I had a ton of slop in the shaft and it was binding a little just of idle making easing into the throttle tricky. The carb shop fixed me up for $30. The slop was gone and had no problems until recently it started binding again. After removing the TB shaft, I noticed there was no bushings.. strange? I wonder if carb shop just did some knurling or something instead of actually installing bushings. Don’t know.
Anyway, I decided to do what I should have done the first time and install shaft bushings myself.
Picked up a Throttle Shaft Bushing Repair Kit Carburetor including a 3/8 Piloted Reamer.
This seems to be a typical problem with TPI throttle bodys as the throttle shaft is in direct contact with the aluminum TB housing.
The shaft hole tends to wear in an irregular oblong pattern causing slight binding and allowing un metered air to enter the engine if it gets bad enough.
The reamer is long enough to slide into the full length of the TB shaft so you don’t have to worry about alignment problems when reaming the two outer holes.
Here’s a video showing the use of the kit on a carb.
https://www.youtube.com/watch?v=buwnm0lvGp8
Here are some pictures of my install. Really easy to do.
Stock shaft hole
Using drill to turn the reamer counter clockwise
New hole ready for bushing
Bushing installed
Anyway, I decided to do what I should have done the first time and install shaft bushings myself.
Picked up a Throttle Shaft Bushing Repair Kit Carburetor including a 3/8 Piloted Reamer.
This seems to be a typical problem with TPI throttle bodys as the throttle shaft is in direct contact with the aluminum TB housing.
The shaft hole tends to wear in an irregular oblong pattern causing slight binding and allowing un metered air to enter the engine if it gets bad enough.
The reamer is long enough to slide into the full length of the TB shaft so you don’t have to worry about alignment problems when reaming the two outer holes.
Here’s a video showing the use of the kit on a carb.
https://www.youtube.com/watch?v=buwnm0lvGp8
Here are some pictures of my install. Really easy to do.
Stock shaft hole
Using drill to turn the reamer counter clockwise
New hole ready for bushing
Bushing installed
