nrg big problems! munched piston

ive got a nrg extreme and tryed running in a malossi 70s kit and blown the piston up but the thing is i cant run it in cos my bikes set up to pull away at 6500 revs with stage 6 vario n tourqe spring n 6.25g rollers and blue clutch springs so what set up is good for pullin away at low revs but with good pull heres the fucked piston and where can i get another malossi 1 of these \/

 

ohh... that a big chunk of the piston gone!....

 

ye do you know a transmition setup tht would let me pull away at low revs but good pull ?

 

put some of the standard stuff back on