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Message: [QUOTE="trial_07, post: 1311963, member: 53593"] My friend had many problems with the engine. We suspect detonation as a cause because he could hear it pinging. First time, a small chunk of the piston above the ring, exhaust side, broke off. Second time, the tip of the sparkplug broke and damaged the piston which only counted two hours. You know about the third time. All this in one season. Here are some pics from when the tip broke off: [IMG]http://i105.photobucket.com/albums/m214/trial_07/IMG_2525.jpg[/IMG] [IMG]http://i105.photobucket.com/albums/m214/trial_07/IMG_2527.jpg[/IMG] [IMG]http://i105.photobucket.com/albums/m214/trial_07/IMG_2528.jpg[/IMG] The tip broke off when he landed and snapped the throttle. I'll talk to him about sending the head to Eric, the season here is pretty much over anyway. [/QUOTE]