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magnum 4stroke

Old 10-12-2002, 06:36 AM
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Default magnum 4stroke

What is the best way to break-in the .61 4stroke?
Old 10-12-2002, 07:03 AM
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Default magnum 4stroke

Is your engine cowled in? Or is it out in the open? If it is cowled in, you could have an air circulation problem. The outlet for the heated air should be two to three times the size of the proper inlet hole.

I would richen the mixture until the engine does not over heat. Don't forget, the engine's fuel mixture will grow progressively leaner the longer the flight continues because of lower fuel height in the tank.

An engine that hasn't been broken-in completely will often over heat too.

Another factor has to do with the amount of oil and the type of oil in the fuel. If you are using the recommended 20% castor oil lubricant in your fuel, you should not have fuel induced over heating problems. Straight synthetic oil at typically lower than the 20% recomended amount could also cause the engine to lean toward over heating.
Old 10-12-2002, 12:15 PM
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Default magnum 4stroke

Keep in mind also, it's a 4 cycle.

4 cycles need to run richer than a 2 cycle would. You may be setting the needle to lean to begin with.

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