With a Tecumseh engine, I wouldn't pull the governer. Too many stories on another forum about the tec's grenading after 5k RPM. Gearing is probly the cheapest way to go, but like stated bfore, you will lose some top end. Bigger engine is also possible, but you have to weigh out what will and will not fit the new power plant( TAV, Clutch, mounting plate, cables, etc...). Does this engine have a clutch, or TAV installed? If clutch only, might consider a comet 30 series, the tecumseh engines are still sought after for their reliability, so helping it out might be a good option.
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