5-25
ENG
CYLINDER HEAD
REMOVAL
1. Remove:
• Cylinder head bolts
NOTE:
Loosen each bolt 1/2 of a turn at a time. After all of
the bolt are fully loosened, remove them.
1
2
3
4
6
7
8
5
INSPECTION
1. Eliminate:
• Combustion chamber carbon deposits
(with a rounded scraper)
NOTE:
Do not use a sharp instrument to avoid damaging
or scratching:
• spark plug bore threads
• valve seats
2. Check:
• Cylinder head
Damage/scratches
→
Replace.
• Cylinder head water jacket
Mineral deposits/rust
→
Eliminate.
3. Measure:
• Cylinder head warpage
Out of specification
→
Resurface the cylinder
head.
Measurement steps:
• Place a straightedge
1
and a thickness gauge
2
across the cylinder head.
• Measure the warpage.
• If the limit is exceeded, resurface the cylinder
head as follows.
• Place a 400 ~ 600 grit wet sandpaper on the
surface plate and resurface the cylinder head
using a figure-eight sanding pattern.
NOTE:
To ensure an even surface, rotate the cylinder head
several times.
Maximum cylinder head warpage:
0.10 mm (0.0039 in)
1
2
Summary of Contents for RS90RK
Page 2: ......
Page 8: ......
Page 65: ...INSP ADJ ...
Page 158: ...2 57 INSP ADJ CARBURETOR TUNING Guide for carburetion ...
Page 195: ...INSP ADJ ...
Page 659: ... ELEC ...
Page 721: ... ELEC ...
Page 816: ...9 33 SPEC CABLE ROUTING 1 7 2 3 4 6 5 A A A A ...
Page 824: ...9 41 SPEC CABLE ROUTING 3 J K I H G F E D C B A 0 9 8 7 4 5 6 2 1 ...
Page 826: ...9 43 SPEC CABLE ROUTING 3 J K I H G F E D C B A 0 9 8 7 4 5 6 2 1 ...
Page 828: ...9 45 SPEC CABLE ROUTING A B B 1 2 3 4 5 6 7 8 9 0 A B 9 C 0 D E G F B B A ...
Page 830: ...9 47 SPEC CABLE ROUTING 1 5 2 3 4 A B 6 5 7 8 9 0 A C A A B B B A A B ...
Page 832: ...9 49 SPEC CABLE ROUTING A A 7 1 2 3 4 6 5 ...
Page 834: ...9 51 SPEC CABLE ROUTING 1 2 3 4 5 6 7 5 B B A A 8 9 4 4 A A B B ...
Page 836: ......
Page 839: ......