Worn carb throttle shafts
Posted April 24, 2010 - 09:18 PM
Rebuild kits that I used on an old Farmall tractor came with felt washers which went over the shaft ends, I'm not sure if this was to decrease air intake around the shaft or just take up end play. If anybody thinks this would help on these walbro carbs, or if you have any other suggestions, let me know. Thanks.
Posted April 24, 2010 - 09:31 PM
Posted April 25, 2010 - 08:28 AM
Posted April 25, 2010 - 12:54 PM
Posted April 25, 2010 - 02:24 PM
I read over the the "1972 MF12g" post suggested by DH1, and I'm not sure how the copper tube would fit. The throttle shafts I have are only worn on the upper section beneath the throttle cable plate and the beveled section where the throttle butterfly mounts. It seems that either machining a new part or "building up" the old would work but I don't have the needed tools. As for purchasing, I've tried to find parts for these walbro carbs for a while but other than rebuild kits (needles, seat gaskets, floats, bowls, etc) I can't find anything. My local parts guy tells me that Walbro discontinued parts for the old LME carbs which were used on a lot of the early Tecumseh H and HH engines. If anyone knows an NOS parts source, I would appreciate the information. Thanks.
I just used a cordless drill and a set of drill bits to drill the top of the carb (did not touch the bottom) until I got a tight fit with the copper tube in the top of the carb, and then used a small round file (chainsaw file) to make the inside of the tube big enough to slide over the throttle shaft. It might not be perfect but alot better than before and the motor has a smooth steady low idle.