taco eater :
Shane Johnson from Hudson, WI United States
So this is probably a re-pop of the original MBK 512 cylinder, I am guessing its a P2R brand. It came stock on some european av10 models. Low squish, and offset spark plug. Im currently running it with a bidalot head due to those reasons. Move your ports up and run a better head and port that exhaust and I wouldnt be surprised if you have a 50/50 bike that goes the distance.