kfx 400 engine
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What did he do to the engine, run it without oil? Do a proccess of ilimination first. Make sure your valve lash is set right. Cmas arn't to worn, check valves, check compression, etc. If the engine just started to perform worse and worse it could be a little thing than might only cost you $10 instead of a lot more. But if you've blown the engine to hell then listen to these other guys.
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