656 won't rev up

Tractorcedric · Oct 26, 2011

A friend has a 656 that dies when you bring the throttle up. Runs good at an idle. Carb and gas tank have been cleaned. Has new points, condensor and plugs. I swaped coils and that did not help. Found that if I advanced the timing it would rev up a little more. It started doing this all at once. Could the spark advance in the distributor go bad?

Janicholson · Oct 26, 2011

Yes, but the effects are not that pronounced.
I suspect the carb has a blockage in the high speed circuit. The passages are small, and need to be runthrough with fine wire, and air to assure they are clean. Soaking the carb in dip cleaner is the best, then the wir then air. TO see if it is for sure fuel, use a propane torch with the nozzle taken off to emitt pure propane.
With the air intake hose off, add propane to the airstream entering the carb. If it revs up better, it is fuel. Keep us informed. Jim

656 won't rev up

Tractorcedric

Member

Janicholson

Well-known Member

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