You'll have to buy a top end gasket kit $20-$30. You'll have to remove your pipe, carb and head. Unbolt and remove the cylinder and clean up all of the sealing surfaces. Then slide the new gasket and cyinder on the base studs/piston. Torque the base nuts to 20ft.lbs. reinstall the head with new gasket and torque head nuts in sequence to 20ft.lbs. then reinstall the pipe and carb. run 4 heat cycles, lightly reving engine to operating temp and cooling back to room temp. Then retorque cylinder and head nuts to 20ft.lbs.......Done Then I recommend having a leak down test done to ensure that the gasket and seals are good.