Posted by robreynolds on November 21, 2012 at 14:07:38 from (72.161.236.122):
I went to an auction and bought a MF 35 with a Continental Z134 engine. The carburetor had a lot of water damage, so I installed a new one. I put on a new cap, rotor, distributor dust cover, and spark plug wires. It has Champion D16 spark plugs, which are correct according to a cross reference I found online. A guy at the auction said that he remembers seeing this tractor run about 5 years ago, which is when the old man parked it.
Currently I have a lawnmower gas tank connected directly to the carburetor just to make sure. I verified that the firing order is correct and starts on the correct cylinder. There is a nice white spark on each spark plug. It cranks but won't start. I took the intake hose off the carburetor and stuck my hand in front of it, and sure enough it is drawing air strongly. Then I squirted a shot of gasoline directly into each cylinder through the spark plug hole, and it still doesn't start.
These tractors are as simple as a bowling ball. I don't know why it hasn't fired up yet. It occurred to me that maybe I had the battery connected backwards, so I unscrewed a plug and stuck my finger in the hole while holding the spark plug against the block. Sure enough, it creates pressure and makes a spark at the top of the stroke, which verified that it is in fact a negative ground system, so I've been doing it right.
But obviously something is still wrong. What's the next thing you would check?
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