Carb Questions 1974 St12
Posted September 24, 2012 - 08:34 PM
He's been searching for another tractor for weeks.....and finally found one. A 1974 ST12....in real nice shape. We put fuel in it and it fired up. It runs well.....however....it wants to stall under a load and it will stall if you have it on half throttle and push it to full throttle fast. If you slowly increase the throttle.....you can get full throttle.
What do you think???? Rebuild the carb??? Fuel pump????
I've been trying to read stuff about rebuilding it....some people are saying not to remove the main jet.
What do's and don'ts do I need to know. And....where can I get a carb kit?
Posted September 24, 2012 - 09:14 PM
1. Check for air leaks around the throttle shaft and the gaskets where the carb bolts on. Many guys use a can of carb cleaner and give it a whiff around these areas. If the engine changes pitch, there's at least one of the leaks. Fix any leaks that you find. If throttle shaft area, you may want to investigate bushing the worn area.
2. Next, I would run a tank of gas heavy with Seafoam or gum out cleaner.
If the choke partially on helps, open the main jet 1/2 turn until you have run some of the treated gas thru, then adjust for best operation.
Posted September 25, 2012 - 04:17 AM
Posted September 25, 2012 - 05:09 AM
Posted October 03, 2012 - 06:19 PM