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Message: [QUOTE="Yamamoto, post: 152272, member: 22578"] [b]OEM Rules![/b] I hate forged pistons. So i took apart the top end and noticed that the piston had scuff marks on all four sides......This is 4 Point seizure ...caused by Inproper warm up or too much heat.....could also be an air leak. My experience with Weisco is that you need to really let it warm up even after your have warmed it up early on. example take aluminum foil and heat it up ...in seconds its ambient again. The piston expands at a much faster rate then your Cylinder and if its not fully wamed up you will seize yor piston. Did I forget to put more pre-mix oil in the lubricate the piston? If you forgot to Premix your gas then thats your problem. You did refill the radiators? RIGHT? I think you have an air leak or you were way to lean....did you hear a shearing noise when you got on the bubble. Melted spark plug ......another lean symptom [/QUOTE]