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When starting John Deere 455 lawn tractor, runs great first 15-20 sec with normal black exhaust, then engine starts knocking and exhaust turns grey at that point i shut it down, tested this 3 diff times all with same result, prior to this, engine would not start, found blown fuel pump fuse, fuel filter was replaced at same time fuse was, any way to test at home to isolate the problem??

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Unless you have a diesel, the black smoke at start up is not normal, it should be white if anything. It sounds like you are burning very rich, or no air at all, check the air filter, check the fuel cond, check the governor thing, make sure it moves freely and rebounds. Change the spark plug. I don't know what else it could be without being there. The carb could be clogged up, some carb cleaner wouldn't hurt. Hope this helps.

Posted on Jul 18, 2010

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