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611 lt engine troubles

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Ben_H
Try doing a compression test after it dies. I have read before about valves sticking when getting warm becuase of carbon build-up etc. When metal gets hot it expands and the valve stem gets stuck open ecpesscially when there is excessive build up on the vavle stem.

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I finally got my deck leveled and grass looking good, but now having engine troubles (briggs 11 hp). The engine starts to die after a 1/2 hr - 40 min of running. I changed oil, cleaned air filter, cleaned cooling fins, and still having problems. The engine will recover by taking off the PTO and putting in neutral, but cannot start mowing again until engine has cooled down. I tried venting the gas tank when engine is trying to die, but no change. Choke at that point will kill it completely. Need help!

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