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I have a 1977 that was only used a couple of times and is in mint condition. The problem is that it will start and idle at half throttle just fine. When I put it in the fast mode it will only run for about 1-2 minutes. It will start back up with no problem. Does any have any ideas


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I'm guessing that the motor is a Tecumseh based on it being a 1977 machine. Considering the engine starts and runs at all is a good sign. It sounds like the high speed jet, which is actually the bowl nut, is dirty and will need to be cleaned. A thorough carb cleaning and replacement of Tecumseh part number 631021B would help greatly. Donyboy73 has some excellent youtube tutorials on cleaning and adjusting Tecumseh carbs.

Just a thought, have you tried loosening the gas cap and see if the engine will continue to run in fast mode? The cap vent mat be clogged with dirt.
 
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