KTM Malaguiti Grizzly LEM 50 cc Air-Cooled Franco Morini S5 GS Top End Piston Rebuild Kit A complete top end rebuild kit to fit the Morini S5 GS Engine (engines with ALUMINIUM cylinders) to include: Top gasket setSmall end bearingA new standard size 39mm piston kitA new standard size 39mm piston kit, to fit the Morini S5 GS Engine (this piston has a port on the inlet side)Will fit other motorcycle brands which also use the air cooled Franco Morini S5 GS engine (noted by the carb mounting to the cylinder and the cylinder being aluminium (not cast iron) AND having a reed block). IMPORTANT : Check picture 2 for the S5 GS dimension of deck height against your piston, should be approx 22mm We can also supply for these engines : Gasket Sets, Small End Bearings, Drive Shaft (sprocket) Oil Seal, Japanese Koyo Crankshaft Main Bearings, Countershaft Bearings, Pistons, Conrod kits £POA