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CYLINDER HEAD
POWR
5-22
E
CHECKING THE CYLINDER HEAD
1. Check:
•
Combustion chamber
Carbon deposits
→
Clean.
•
Water jacket
Mineral deposits/rust
→
Clean.
CAUTION:
Do not scratch the contacting surface of the
cylinder head and cylinder head cover.
2. Measure:
•
Cylinder head warpage
(use a straightedge and thickness
gauge)
Out of specification
→
Resurface/
replace.
Resurfacing steps
(1) Place a 400 – 600 grit wet sandpaper on
the surface plate.
(2) Resurface the cylinder head by moving
it in a figure-eight motion along the
sandpaper.
NOTE:
Rotate the cylinder head several times to
ensure an even surface.
Warpage limit
0.1 mm (0.004 in)
Summary of Contents for 25BMH
Page 48: ...FEATURES AND BENEFITS GEN INFO 1 12 E COOLING SYSTEM Fig 7 ...
Page 49: ...1 12 CARACTERISTIQUES ET AVANTAGES GEN INFO F ...
Page 50: ...1 12 MERKMALE UND VORTEILE GEN INFO D ...
Page 51: ...1 12 CARACTERÍSTICAS Y VENTAJAS GEN INFO ES ...
Page 92: ...MAINTENANCE SPECIFICATIONS SPEC 2 8 E DIMENSIONS ...
Page 156: ...GENERAL CHK ADJ 3 26 E NOTE Grease the inner cable and the lock nut 2 Apply Yamaha grease D ...
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Page 446: ...Printed on recycled paper Printed in Japan Oct 2000 1 9 1 25BMH 30HMH YAMAHA MOTOR CO LTD ...