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[quote="Gary Maker"]Over 400 flights with heavy use and your reluctant to buy another? I would say neither of these engines owe you a thing. You do know that machinery does actually wear out especially with heavy use right? Sorry, don't mean to sound sarcastic, just making a point! At 400 flights your probably pushing 100 hours of running. Even a full sized engine needs a pretty extensive maintenance check up after 100 hours.
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Actaully 400 flights at 10 min a flight is 67 hours or so. Then he did that over two engines so thats only say 33 hours. 33 hours and the engine shouldn't be worn out yet.
Bearings though are a wear item and won't last forever especially if hard on them.
And with the mufflers if they fall apart (bolt breaks) it is usually from overtightening.
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-Tom-
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