I left the petcock on my cm400t for a few days and found that though it was leaning left on kickstand gas had filled the opposit cylinder and I had to remove plug to let out the gas cause of pressure buildup so that it would turnover and start..
My first thought is float needle isn't seated or intake valve isn't seething. I recently adjusted valves gaps too proper specs.
Any other possibilities I might have overlooked?
No I did not. But it ran fine all day and will change oil tomorrow. However, what causes such a leak of gas into the cylinder, gravity? I assumed a sticking valve or float needle not seating properly.
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