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What happens if you give it full throttle without it being in gear? Does it rev right up or does it stumble or delay? Open the main jet a little and see if more fuel helps. Do you have the governor rods hooked up right? When I got my 8N, the previous owner had them hooked up to the wrong levers. Do you have the spark plug wires on in the correct order? 1-2-4-3, #1 in front, nearest the radiator. Lack of power is usually caused by poorly adjusted carburetor, or timing and ignition problems.If you can safely eliminate those factors, then the governor may be faulty. You can remove two bolts to get it off and then you remove 1 set screw to pull it apart. Check it for wear in the tapered race and flyballs that are flat-spotted. Also see if the flyballs have chewed up the housing, another common problem. Worn centrifugal advance parts can cause lack of power, and in rare cases, over-tight brakes can cause the tractor to bog down. A worn-out engine, or burned valves can also cause lack of power. I'd start with easy obvious stuff first.
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