Hello last summer I rood my MC28 and rev up fast 2 times to almost top speed at a length less then a mile. Sudenly I felt that there was something wrong so I shutted down the throtle. Result a molten piston at the exaust side of the lower barrel. Could someone tell me what is wrong in my setup?

I have Jollymoto pipes, VHM cill heads with the standard squis, HRC030 card, standard airbox with the restriction cut off, Tyga mainfolds, MJ sizes *** for the upper and *** for the lower. And I run premix 1:30







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