Posted by Owen Aaland on October 10, 2011 at 20:45:16 from (216.47.32.147):
In Reply to: Backfiring posted by J.D.HEICHEL on October 09, 2011 at 20:44:23:
Ah... The most interesting ones are those that let you get off the tractor and get about 10 feet away before it backfires!
When the ignition is cut off fuel continues to be drawn in from the carburetor and out the exhaust. The back firing is the result of unburned fuel being ignited in the muffler. Carbon deposits in the muffler can make it worse. Giving the tractor a good workout may help by getting the carbon burned out of the muffler. A worn out engine can make it worse because the engine will turn over more times until it stops. The only solution is to get the temperature of the muffler lower and/or to have less fuel enter it as the engine spools down. Let the engine idle to cool the muffler and set the idle as low as practical to cut down on fuel.
Electric fuel cut off solenoids were added to carburetors on later tractors to eliminate this problem.
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