Installing The Piston And Cylinder - Yamaha TW125 1999 Service Manual

CYLINDER AND PISTON
Piston-pin-to-piston clearance =
Piston pin bore size b –
Piston pin outside diameter a
Piston-pin-to-piston clearance
EAS00267

INSTALLING THE PISTON AND CYLINDER

1. Install:
S top ring 1
S 2nd ring 2
S lower oil ring rail 3
S upper oil ring rail 4
S oil ring expander 5
NOTE:
Be sure to install the piston rings so that the
manufacturer's marks or numbers face up.
2. Install:
S piston 1
S piston pin 2
S piston pin clip 3
NOTE:
S Apply engine oil onto the poston pin.
S Make sure that the arrow mark a on the piston
points towards the exhaust side of the cylinder.
S Before installing the piston pin clip, cover the
crankcase opening with a clean rag to prevent
the clip from falling into the crankcase.
3. Install:
S gasket 1
S dowel pins 2
4. Lubricate:
S piston
S piston rings
S cylinder
(with the recommended lubricant)
Recommended lubricant
4-28
ENG
0.010 X 0.026 mm
New
New
Engine oil