Bolt on big power for all years of the Yamaha TTR110! This kit features our 55.5mm lightweight high compression domed piston with piston rings, pin, and clips (91+ Octane pump Fuel Safe too!). 55.5mm (130cc) is as big as you can go on these engines without having to disassemble the engine and bore the cases. Our aluminum steel sleeve cylinder will fit right in place. A dual stage 35mm pod air filter to let it breath better for more power and better throttle response. Our top end gasket kit includes the correct sized base gasket and head gasket. It also includes a new exhaust gasket and timing chain tensioner gasket. Finally it comes with an assortment of both Pilot and Main Jets to dial in the jetting after the kit is installed. This high quality bore kit will add big power to your TTR110 that you will defiantly notice.