ATC / TRX 250R

We can tailor these set-ups for various styles of riding as well as Pipes, Carb & Fuel used

We  O-ring the OEM Head to provide the best possible seal and combustion chamber shapes to go along with our porting.  * This price is ONLY additional when getting above listed Porting/Head Mod Package

We can build a 4mm stroker engine utilizing an OEM Cylinder & Head as the base of the package.  

Requires customer to provide us with an OEM Cylinder that has not been decked or ported.

Uses std. .190" spacer plate and TRX OEM Style 3-piece head gasket. 

Stroker crank available from us for additional cost 

We start with a Builder Series cylinder, so we can tailor the porting & cylinder head shape the way we want, as well as setting clearances correctly. Custom & Shelf Domes available. 310, 330, 350, 363, 370 & 390

Modify Cases to fit Big Bore Cylinder 

( Up to 78mm Cylinder Bore )

Includes Bearing

We have tooling & Jigs to rebuild the Honda "Tin Can" Cranks

We carry Hot Rods Short Rod, Long Rod & 4mm Stroker Cranks. We also offer Tin Welding for that extra insurance. We can also rebuild your current crank

We have Std., Oversize & Big Bore pistons available from ESR, LAPC, Pro-X & Wiseco. Many sizes In-Stock