Join Date: Nov 2000
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Re: carb/fuel question
While you are cranking it over, the motor is spinning at a very low rpm compared to running. The mechanical pump works by a cam pushing a lever. Because its on the camshaft, it spins at half the engine speed. Each push of the cam on the lever depresses the diaphragm in the pump and squirts gas. That's what you are seeing, and as long as it pump decently at cranking speed, the pulses of fuel are to be expected.
After the motor sits for a while, you can see if the float bowl is dry (not sure how that would occur) by looking down the venturi and moving the throttle linkage. If there is no fuel, the accellerator pump won't work. Try that next time it wont start to see if the bowl is dry.
After a two year break, the old fuel would be stale and not burn well. Also, the fuel that evorated would have left sludge in the system and it could be plugging the idle circuits. Consider cleaning and rebuilding the carb.