As others said, be sure it has the correct plugs, might go one or 2 heat range hotter.
Is the thermostat working and the right temperature?
Is the air filter clean? If it has an oil bath, has the canister (the horse hair part) been removed and washed out?
Is the choke open fully, float level correct. carb working well? If all check out, try leaning the main jet, lean it until it looses power, then back it out just enough to run good.
Is the crankcase breather clean? Oil level correct (right length dip stick)? What is the carbon build up condition under the valve cover? Possible the drain holes are clogged causing the cover to fill with oil (extreme, but possible).
If all checks out, it just may be time for a rebuild.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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