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Thank you, Jr.

Unfortunately 98 octane are missing in my country. 100 octane is very rare. ADA has only 40cc domes for 91 octane and 38 cc domes for 98 octane in a suitable range. I use 38cc, Like a compensation: fuel/oil ratio 35:1 and carburators tune up

Thank you for your kind adviсes. I meant that there is a fat aluminum body in the top part of the piston, which accumulates heat. In these "hot" places we milled the cooler-holes, as in the photo with Wiseco piston. In many kind of 2-stroke pistones these cooler-holes are present from "factory...

In my opinion, Wiseco pistons have a very thick aluminum body at the top above the piston pin. This fat body accumulates an elevated temperature, not having time to cool down enough. I suppose that in the top part of the piston above piston pin it is necessary to mill a "cooler" in this place...

Guys, thank you very much for your kind replies. I do not have standard sleeves, I understand that standard sleeves are too thin. My sleeves are custom made, thick-walled and made of gray cast iron. As for the pistons: there is no detonation problem. Problem with seizure when the engine runs...

Hi, I think about installaiton of 86mm Wossner pistons (part # 6012D200) in my modified Yamaha Super Jet engine (760 sleeves and ADA Billet head with 760 Domes, Factory B pipe). Early I used Wiseco 85,5 mm pistons (757M08550) in this engine, but I had a problems with over temperature. Now I want...