Before removing the cylinders, the cylinder head, valve pushrods, pushrod tubes, and deflector plate below the cylinders must be removed. The cylinders may then be pulled off.
Reinstall the cylinders as follows:
Cylinders should be checked for wear, and if necessary replaced with another matched cylinder and piston assembly of the same size. Also check the cylinder seating surface on the crankcase, cylinder shoulder, and gasket, for cleanliness. Foreign matter here could cause leaks due to distortion of the mating parts. When reinstalling the cylinders, a new gasket should be used between each cylinder and the crankcase.
The piston rings, and piston pin should be liberally oiled (a MoS 2 based lubricant is suitable). Compress the rings with a compression tool. Be sure that ring gaps are adequate and staggered on the piston with the oil ring inserted into the cylinder so that its gap is positioned UP when the pistons are in their horizontal position in the engine.
Lubricate the cylinder wall and slide the cylinder over the piston. Crankcase studs should not contact the cylinder cooling fins. Install the deflector plates under the cylinders, bending slightly if necessary to make them seat tightly on the cylinder head studs.
Install the pushrod tubes and pushrods, ensuring that the tubes are inserted with the seam facing upwards and are of the proper length.