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Internal combustion engines run on after stopping because of carbon buildup in the cylinder/s. The hot carbon acts as a spark plug for residual fuel. The process keeps going until the carbon cools to below the flashpoint of the fuel.

Fuel additives are made to address this problem. You may also open up your engine and scrape and brush away the deposits; an expensive, time-consuming project. You might also try adjusting your carburetor to run a little leaner, to slow down the buildup process. Also, the oil rings on the piston/s may be worn, allowing oil to enter the cylinder to become deposited in the cylinder upon burning. A cylinder compression check is usually made to determine the cylinder's airtight integrity. Additives are made to address this problem. To fix this problem requires removal of the piston and replacement of the oil rings; another expensive, time-consuming project.

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15y ago

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