TB 170cc Bore Kit - GPX-YX150

170cc Big Bore Kit:

- All aluminum ceramic plated 64mm skirtless cylinder
- Lightweight high compression 64mm piston with rings, pin, & clips
- Head gasket kit - includes the cylinder head o-ring set and an exhaust gasket.

This is our most affordable 170 bore kit for the YX150/GPX150 engine. Works great with your stock YX150/GPX150 head or our new V2 Race Head. The kit includes an all aluminum ceramic plated 64mm skirtless cylinder which will increase your engine displacement to 170cc. This cylinder is lighter than a steel sleeved aluminum cylinder, reduces friction (increasing power), improves sealing, and provides better heat transfer (runs and cools down quicker). Additionally, our head gasket kit includes a head o-ring set and exhaust gasket so you don't have to re-use your old ones or make a trip to your local dealer to get new ones and spend more money. The new bore kit consists of high quality parts and requires no machining to the cases - bolt on and go!

There are no installation instructions, but if you can replace your piston, you can install this kit. If you don't have any experience working on your engine, we highly recommend having a professional technician install this kit. The parts are installed in the same manner as OEM parts.