SOURCE: 5 HP troy bilt chipper sherdder will not rev up under load
Either or do one of two things if the motor runs pretty well Start the engine and run it full throttle. Once there if it has a high speed jet turn the screw in to start with until the engine stumbles a bit and then turn it back about a half turn. When you turn it in you should here the engine peak out. .If it is blowing black smoke out the exhaust it means the high speed screw is to far out so turn it in until it smooths out.If the engine smooths out then you have cured the problem. Good luck.
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