Yamaha YP250 Mobility Scooter User Manual


 
4-25
CYLINDER AND PISTON
ENG
NOTE:
NOTE:
EB404184
PISTON RINGS, PISTON AND CYLINDER
INSTALLATION
1. Install:
STop ring
1
S2nd ring
2
SSide rails (oil ring)
3
SExpander spacer (oil ring)
4
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:
SPiston
1
SPiston pin
2
SPiston pin clip
3
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:
SGasket (cylinder)
SDowel pins