It's all about the needle settings. Starting with the high end needle, peak the engine for max rpm and then back off 1/8 turn. Drop the rpm down to about 2500 to 3000 and tweak the low end needle for max rpm and see what happens. Go back to the high end needle and check it again, it probably changed a little. Now go back to the low and re-peak. You should then be close and only 1/16 turns should be needed to get the low end needle right. The top should not need to be changed again.

Make sure the engine is very secure and keep your hand out of the prop!!!!!!!!!!! You need a 1" or less screw driver blade to do it this way.

[b]Disclaimer. [/b] A spinning propeller can be, and has been, extremely dangereous and can do severe harm to the human anatomy. Extreme caution should always be used when attempting to adjust or perform work on a running engine with a spinning propeller to prevent death or injury. The safety of the individual working on the engine is the responsibility of that individual.

The oil mix should be between 70 and 80-1 using a good synthetic. Plug fouling will occur at mixes under 65 to 1