Piston Rings, Piston And Cylinder Installation - Yamaha YP250 Service Manual

CYLINDER AND PISTON
EB404184
PISTON RINGS, PISTON AND CYLINDER
INSTALLATION
1. Install:
S Top ring 1
S 2nd ring 2
S Side rails (oil ring) 3
S Expander spacer (oil ring) 4
NOTE:
D Make sure to install the piston rings so that
the manufactuer's marks or numbers are lo-
cated on the upper side of the rings.
D Lubricate pistons and piston rings liberally
with engine oil.
2. Install:
S Piston 1
S Piston pin 2
S Piston pin clip 3
NOTE:
D Apply engine oil onto the piston pins.
D The "!" mark a on the piston must face the
exhaust side of the cylinder.
D Before installing the piston pin clip, cover the
crankcase opening with a clean rag to pre-
vent the piston pin clip from falling into the
crankcase.
D Make sure to install each piston in its respec-
tive cylinder.
3. Install:
S Gasket (cylinder)
S Dowel pins
4-25
ENG