4 - 29
ENG
CYLINDER HEAD
INSPECTION
Cylinder head
1. Eliminate:
●
Carbon deposits (from the combustion
chambers)
Use a rounded scraper.
NOTE:
Do not use a sharp instrument to avoid dam-
aging or scratching:
●
Spark plug threads
●
Valve seats
2. Inspect:
●
Cylinder head
Scratches/damage
→
Replace.
3. Measure:
●
Cylinder head warpage
Out of specification
→
Resurface.
Cylinder head warpage:
Less than 0.05 mm (0.002 in)
Warpage measurement and resurface-
ment steps:
●
Place a straightedge and a feeler gauge
across the cylinder head.
●
Use a feeler gauge to measure the
warpage.
●
If the warpage is out of specification,
resurface the cylinder head.
●
Place a 400 ~ 600 grit wet sandpaper on
the surface plate, and resurface the head
using a figure-eight sanding pattern.
NOTE:
To ensure an even surface rotate the cylin-
der head several times.
Содержание YZ426F
Страница 47: ...GEN INFO MEMO ...
Страница 69: ...GEN INFO MEMO ...
Страница 193: ...INSP ADJ MEMO ...
Страница 577: ... ELEC MEMO ...
Страница 605: ...TUN MEMO ...
Страница 632: ......
Страница 633: ...PRINTED IN JAPAN 2001 7 2 5 1 CR E F G PRINTED ON RECYCLED PAPER YAMAHA MOTOR CO LTD 2500 SHINGAI IWATA SHIZUOKA JAPAN ...