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You clearly need more power. I'm surprised no one has suggested adding a turbo or a nitrous injector to hit when the mower bogs down. Of course you could wimp out and bolt on a 7.5 horsepower engine, but where's the challenge there? I wouldn't go over 2 litres na or a 1 litre forced induction motor for a 21" mower though. You don't want to overdo it - wait, you can't overdo horsepower. Nevermind that.
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