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|Louis Steiner||I had the engine running in December last year. I tried to start it again last week, but could not get gas to the cylinders. I cleaned the carb (Marvel Schebler) and replaced the gasket, but no help. I watched the valves open and close. I could blow air into the sparkplug hole on each cylinder and have it blow out the connection to the carb. I had new rings and new valves installed a year ago. I appear to have good compression, but I don't know what it should be.
My understanding of how this should work is as follows: the downstroke of the piston should create a partial vaccumm which will draw the gas from the carb to the cylinder. The venturi does not fit tightly between the upper and lower halves of the carb, but I do not see in the parts manual any gaskets that should go on either end of the venturi. Am I thinking correctly?
I can manually squirt gas into the cylinders and have the engine run momentarily. I am just about at wits end on what could be the problem. Any help would be greatly appreciated as I am shooting to get the tractor to a parade the middle of July where hopefully my 89 year old father can drive it.
Thanks, Louis Steiner
|wayne etter||Check the fine screen in the carb. It is attached to the gas line fitting that screws into the carb.
that is my only guess. I can't help you on the gasket.
|Ron||did you get it running. I have a loaner carb on my Zau that should fit.
|Helmut neufeld||I know this sounds stupid but do you have gas in the carb. Could be as simple as a plugged fuel line. Try spraying WD-40 into the carb intake as you turn the engine. If it is a fuel problem it should fire on the on the WD-40. Helmut
|Louis STeiner||THanks Helmut,
I found the problem in July. It turns out that the intake/exhaust manifold gaskets which were new when I installed the manifold, compressed after running the first time and caused a small air leak which kept a vaccumn from being drawn to pull up the gas from the carb into the intake manifold. I tightened the bolts and it started right up. Sure had me going for a while though!