Atc250r, Trx250r, Atc Trx 250r Esr Ceo 330 CC Big Bore Cylinder Kit, Power Valve

  
This 330 Cylinder is ported & designed to be used with an 87-89 style crank. We may help you get a Hot Rods crank if you need, Please ask. I just received 1 of these ESR 330cc CEO exhaust valve cylinder kits. You must have your engine cases modified to accept this larger cylinder shirt. This kit comes with all that is shown it the 1st picture, the piston size will be 75.5mm. NO MORE DECIDING WITCH PORT JOB THIS CYLINDER DOES IT ALL NEW PISTON AND HEAD DESIGN. THIS IS BY FAR THE BEST RUNNING 310 I HAVE BUILT OR RODE. THE POWER BAND IS WAY WIDER.