Got my G out of the shed yesterday for a spring warm up. After maybe 30 minutes of running down the road full throttle, when starting up a slight incline, putting the engine under a little load, it began to lose power and surge. When choked it got worse momentarily, but then straightened up for a while. As I recall, it was doing the same thing last fall and I never got to the root of the problem. It has new gasoline, good fuel flow, no water in fuel. Carb had been thoroughly cleaned (tag wire through all passages, soaked in cleaner, spray cleaner used too and blown out. Float set to spec. Any ideas?
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Did you check for loose bolts or nuts on the carb connection to intake manifold and manifold to block? The surging may have been caused by a leaky gasket, manifold to block or carb to intake manifold. You might also have a small leak around the throttle shaft in the carb that his allowing air to be sucked in when the engine does not need it. You can also apply a small amoutt of heavy oil on these joints to see if the surging goes away.
AS parts warm up there is thermal expansion which causes the gasket parts to slightly change position. There is a possibility that the areas between the carb to manifold are not exactly tight and the same as the the manifold to engine block fit has slightly expanded to a point where excess air is admitted throwing off the air/fuel mixture so it becomes too lean to properly run. In the event the manifold is warping slightly and twisting this is all you need.This can also happen with the throttle shaft seal leakingallowing excess air into the intake manifiold.
Take the cap off the tank, then take the gas line off at the carburetor. Blow a shot or two of air back thru the sediment bowl into the tank and try it again. Sediment fines can collect in the tank shutoff as well in the inlet of the sediment bowl and restrict fuel flow. If the sediment bowl does not have a good screen the fines can collect in front of the power jet. It my not be your problem but only takes a short to make sure it is not your problem.
Thanks, may be good ideas too but last summer I thoroughly cleaned the fuel tank, even rattled chain around in it and then gave the innards a Red-Kote lining. Then went back together with new fuel line. Went through sediment bowl too. I'll check it out. Checking for a good fuel stream from the bowl drain should do the same thing shouldn't it? I've not done that when the engine is warmed up yet.
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