Trail Bikes 108cc Big Bore Kit + Roller Rocker V2 Race Head + Stroker Crank - Z50 / XR50  CRF50  XR70  CRF70  CT70

Trail Bikes - 108cc 52mm Big Bore kit, V2 Race Head with stroker crank (Makes a 50cc into a whopping 108cc!!) Fits: Honda 1988-199 z50 Honda XR50, CRF50, Honda XR70, CRF70 Honda CT70 (1991-1994 ONLY), Other Various 12 Volt Engines Includes the following:      -New V2 Roller Rocker Race Head      -28.5mm intake Valve      -23.5mm Exhaust Valve      -5mm Valve Stem      -26mm Intake Port - Matches Intake Manifold Kit 0433      -23mm Exhaust port      -High Performance Race Camshaft (For V2 Head)      -51mm Crankshaft with NTN bearings      -Lightweight aluminum cylinder with steel sleeve      -Cast in mounts on cylinder for aftermarket skid plates      -Oversized cooling fins on cylinder for efficient heat dissipation      -High compression 52mm piston with rings, pin and clips      -52mm Top End Gasket Set      -All pistons in the V2 kits are new with CNC machined piston domes      -Head kit includes all hardware      -Head kit Includes all covers Please Note: It will save a lot of time and effort if the oil pump is installed while installing the bore kit (requires cylinder removal) Make sure to order a high output oil pump part #FF0226TB