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Re: H that keeps running after it is shut off
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Posted by Steve - IN on September 28, 2003 at 16:01:22 from (12.222.30.13):
In Reply to: H that keeps running after it is shut off posted by Pete H on September 28, 2003 at 15:35:04:
Pete, Assume that you're using the term "diesel" to mean it keeps running when you switch off the igntion. Dieseling is generally caused when an engine is running hot enough to turn carbon deposits in the combustion chamber into a source of igintion. That is, even when the spark plugs are shut down, there's enough heat in the crud in the chamber to ignite the gas. That's become a common problem with lean burning emission control engines. So a lot of modern engines have solenoids which shut off gas flow when the igntion is turned off to prevent this problem. The first, easy, step to try would be to close the throttle before you switch off the ignition. Next trick would be to turn the main jet to rich, or counter clockwise, a turn or two -- it's that screw pointing to the rear and down at a 45 degree angle from the carb -- a richer setting won't generate the extra heat that causes the dieseling. If there's still no fix, try lowering the float setting so there's not as much gas available in the bowl of the carb. Worst case would be to pull the head and the pistons and clean off all those carbon deposits which are causing the problem.
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