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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