Cylinder assembly for Honda DJ1 scooters. This is the block in which the piston moves: the cylinder walls define the combustion chamber and carry heat away.
Replacement is needed if the walls are worn or scored, compression drops, there is knocking, or oil consumption is high.
- Lubricate the moving parts with engine oil and break in the engine at moderate rpm.
- While you are at it, inspect the neighboring parts of the assembly: they often wear out together.
