It is the ethanol in the gas. It evaporates and what is left doesn't burn very well and is sticky. On my gas engines that I don't use very often I try to get gas without the ethanol and put "Sea Foam" gas treatment in every tank. I get about one carburetor a week that just needs the stale gas cleaned out of it. You need a good carb. cleaner too. I was using a cheap brand and if you checked the parts after they dried off they where still sticky. I use Gum out brand now and it seems to clean better. I even had a new tiller that was used once last fall. It had the kill switch on the spark plug. So when you killed it the engine draws gas in as it spins down. That raw gas gummed up the intake valve so bad by this spring that I had to remove the head and valve to wire brush the varnish off of it. The tiller would hit once and coast to a stop. Then the valve would slowly return and it would hit once again. I fear that in a few more years that our older gas engines are going to be hard to keep going with the gas available.
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I�m handing him tools and he says, "give me that..." and I�ve already got it in his hand or "hand me that....."and I�ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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