yes. Throttle plates open. That shouldn’t matter, I should feel a suction with throttle plates closed.
How do you determine that?
with good compression. What would make it dead?
Bad crank seals
Wouldn’t there be signs of oil under flywheel? Or are you talking between cylinders? Would the middle sealing ring affect both carbs?
under normal conditions it should , however ,not if there is an air leak in the lower part of the engine , it will not suck air @ idle. hence my reason for asking .
If there’s an air leak in the lower half wouldn’t it affect the lower carb and not the upper?
sorry i meant top carb .
At first, on muffs, the engine would start up and sometimes run away. I couldn’t shut the key off to stop the engine. I noticed that the voltage regulator wasn’t working and replaced it. The engine doesn’t run away anymore but only runs at high idle. Even at 3000 RPMs there’s no suction on that top dual carb. Lower the idle and it seems to run out of fuel. I’ve never seen a situation where I didn’t have suction from the top carb. Usually you put your hand over the carb, you can draw more fuel out of the carb. This has nothing. Carbs have been cleaned several times. They’re non adjustable dual carbs.
What? The piston is an air pump. It drawing air in through the reeds and on the down stroke air goes out the exhaust.
