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Refitting the cylinder/piston assembly
If new parts are used, it is necessary to match cylinders and pistons of the same selection.
The letter that indicates the cylinder selection is punched on its upper side, in the cylinder-head coupling
surface; the letter that indicates the piston selection is punched on its crown, between the two valve
recesses.
If the pistons have been separated from their cylinders, before reassembling these components, position the
piston ring gaps at 120° from one another (the markings must always face the piston crown).
Using a universal tool, gently insert the piston in the cylinder (lubricate the cylinder inner side with engine
oil before inserting the piston).
Remove any deposits and degrease the contact surfaces of the crankcase half and the cylinders.
Check that pin (1) is installed on the engine block.
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