Model Engine Company of America
Overheating can be caused by several things or a combination of several things.
Very common is use of a poorly designed muffler which restricts the exhaust flow. If you are using a muffler other than stock try running your engine with the stock muffler supplied with the engine. If this solves the problem you have your answer.

Lean fuel mixture will cause excessive heat. Be sure you know how to tune your engine and know the sounds it should be making.
See carb adjustments
Too little oil in fuel. We always suggest at least 18% oil by volume, not weight. Less than this may compromise your engine. Fuel should display the oil content as well as the nitro content.
See also fuels.
The compression ratio is incorrect.
See compression ratio
The above information is provided as a guide. Since MECOA/K&B has no way of determining the ability of the individual using and understanding this information, we assume absolutely NO RESPONSIBILITY for any damage to person or property from the use of this information.
 

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