Hi guys, my problem is, my sa50 don´t have the original refrigerator turbine, then purchase in the web. With the non original turbine, the engine stoped with the extreme heat and the piston clinch to the cilinder until the engine stay cool. With the original turbine don´t do it anymore. Now I make the engine new, and start to do it again with the original turbine. Maybe I put the head of cilinder in wrong position but in any position coincide. Any suggestion???? Thanks and sorry for my bad english.