4-8
ENG
2. Measure:
8
Outside diameter
a
(piston pin)
Out of specification
→
Replace.
Out side diameter (piston pin):
9.996~10.000 mm(0.3935~0.3937in)
3. Measure:
8
Piston pin-to-piston clearance
Out of specification
→
Replace piston.
Piston pin-to-piston clearance =
Bore size (piston pin)
Outside diameter (piston pin)
Piston pin-to-piston clearance:
0.004~0.019 mm(0.0016~0.00075 in)
<Limit: 0.07 mm>(0.003 in)
4. Inspect:
8
Bearing(piston pin)
Pitting/Damage
→
Replace.
PISTON PIN AND PISTON INSTALLATION
1. Apply:
8
Engine oil
(to the crankshaft bearing, connecting
rod big end bearing, small end bearing,
piston pin, piston ring grooves and pis-
ton skirt areas.)
2. Install:
8
Reed valve gasket
8
Reed valve
8
Carburetor joint
1
11Nm(1.1 m.kg, 8ft.lb)
CYLINDER HEAD, CYLINDER AND PISTON
1
T
R
.
.
→
a
←
A
Summary of Contents for YW50AP
Page 1: ...YW50AP 5PJ F8197 10 LIT 11616 15 39 ...
Page 214: ...YAMAHA MOTOR TAIWAN CO LTD ...
