Posted by Nicholas Whitman on December 10, 2009 at 06:41:42 from (69.205.50.192):
I am plowing and pushing brush with a 1956 Cub. I have a recurring problem with the engine speed "rolling" up and down.
This condition is sometimes brought on by the plow hitting a stationary object - stump stub for example - when the tractor comes to an abrupt stop. It gets bounced around pretty good when pushing snow. There is plenty of moisture when plowing but not pushing brush. Tractor resides in a heated garage in winter. Spark is ok. 12 volt conversion lets her start right up.
My best guess is it is caused by dirt getting into the carburetor which is shaken loose. If I remove and blow out the carb I am back in business. Though I never find a smoking gun. I do catch rust/dirt in the bowl, but I clean out the bowl and screen as well as the screen at the start of the carb. My tank interior isn't perfect but I'd rather not have to do a full treatment on it. My fuel comes in clean. I'm not working in a dusty environment. My thought is the screens just aren't preventing dirt from getting through. What would you guys think of adding an line fuel filter?
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