Big Bore 900 Piston / Patriot 850 ptbct This will not fit 583

This will not fit 583 fan cooled motors

Pro RMK 850 w/155"x3" track • 2019

22UP MATRYX BOOST STAGE 4 HILL CLIMB RACE+50HP 110 OCTANE v1 NO BREAK IN

The larger volume works very well with higher boost pressures as the air does not bottleneck and create heat

including the Pro S

Big Bore 900 Piston / Patriot 850 ptbct This will not fit 583Wiseco 900 Big Bore Piston and Factory 9R Piston Direct replacement for our 900 Patriot Big Bore Choose between forged or Cast Piston If you are refreshing your top end select QTY 2 IF YOU HAVE OUR BIG BORE PLEASE SELECT THE SAME PISTON THAT WAS IN YOUR KIT ORGINALY. THEY ARE DIFFERENT SIZES AND YOU CAN NOT SWAP BETWEEN THE TWO TYPES. WISECO AND FACTORY 9R