Re: What causes run-on?

Posted by HTR on October 07, 2004 at 20:01:16 from (209.163.124.196):

In Reply to: What causes run-on? posted by Dug on October 07, 2004 at 15:50:56:

All of the answers are fine about hot carbon causing run on. But, on your 2510 I would say your problem is a defective, or missing, fuel shut off solenoid. The solenoid should be located on the bottom of the carburetor,and also has the load jet adjusting screw in it. A few of the 2510s came from the factory without the selonoid, but was usually installed later, to cure the run on.

Back in the 60s General Motors devised a throttle pull off dash pot to close the throttle plate completely, to stop the dieseling/ run on. Years later it was discovered that some of the run on problem, was feed back from the alternator, after the ignition switch was turned off.

There also was some alternator feed back problems with the original Motorola alternators on the small gasoline John Deeres. The shut off solenoid cures this.

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