Yamaha E60HMHD Wartungshandbuch Seite 270

CRANKSHAFT ASSEMBLY AND CYLINDER BODY
CHECKING THE CYLINDER BODY
1. Check:
• Cylinder inner surface
Score mark
(use #600 - 800 grit wet sandpaper)
• Water jacket
Mineral deposits/rust
CAUTION
Do not scratch the contacting surfaces of
the crankcase and cylinder head.
2. Check:
• Exhaust passage
Cracks/damage
Carbon deposits
(use a round scraper)
CAUTION
Do not scratch the contacting surfaces of
the cylinder and exhaust cover.
3. Measure:
• Cylinder bore "D"
(with a cylinder bore gauge)
Out of specification
NOTE:
Measure the cylinder bore diameter at three
positions for both D1 and D2. Then, average
the measurement.
Cylinder bore 72.00 - 72.02 mm
diameter "D" (2.8346 - 2.8354 in)
Taper limit
"T"
Out of round
limit "R"
D = Maximum D1, D2, D3, D4, D5 or D6
T = (Maximum D1 or D2) - (Minimum D5 or D6)
R = Maximum (D1 - D2) or (D3 - D4) or (D5- D6)
A: 10 mm (0.4 in) below the cylinder top
B: 5 mm (0.2 in) above the exhaust port
C: 5 mm (0.2 in) below the scavenging port
5-38
Clean.
Clean.
Replace.
Clean.
Replace.
Standard Wear limit
72.10 mm
(2.8386 in)
0.08 mm
—
(0.003 in)
0.05 mm
—
(0.002 in)
E