Posted by showcrop on August 02, 2016 at 12:09:34 from (75.68.77.41):
In Reply to: Dieseling Question posted by Spudm on August 02, 2016 at 08:33:28:
As others have said dieseling is usually caused by hot spots in the combustion chamber from carbon deposits, from running too lean, or from retarded ignition timing, or from too high an idle. The mixture, the idle speed, and timing can be checked and hopefully one will be found to be out of adjustment and can be taken care of. Carbon deposits can be tougher to get rid of. They are usually caused by too much idling, or running too much at too low a temperature. They can also be caused by introducing too much oil whether from worn valve seals, worn rings, or adding cheap mineral oil based additives. Running gas of too high an octane will also cause carbon because it burns at a lower temperature. Regular gas should be used unless the engine knocks under a load with the timing set properly. Use of high octane gas on a low compression engine is not only a waste of money but it can damage an engine if used for too long, due to the low operating temperature. Carbon in the combustion chambers can be removed by introducing a mist of water slowly into the carb throat with a spay bottle with the engine set to a high idle.
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