Yamaha F400A 2022 - Removing the Cylinder Head; Disassembling the Cylinder Head; Checking the Cylinder Head

Cylinder head
7-59
Removing the cylinder head
1. Remove:
• Cylinder head
Do not scratch or damage the mating sur-
faces of the cylinder head and cylinder
block.
TIP:
Remove the M11 cylinder head bolts using a
triple square socket.
Disassembling the cylinder head
1. Remove:
• Intake valves
• Exhaust valves
TIP:
Make sure to keep the parts in the order of re-
moval.
Conventional special service tools
New special service tools
Checking the cylinder head
1. Remove:
• Combustion chamber carbon deposits
2. Check:
•Cylinder head
Damaged/scratched → Replace.
• Cylinder head warpage
Above specification → Replace.
1
A
2
A. Conventional special service tool
B. New special service tool
Valve spring compressor “1”
90890-04200
Valve spring compressor attach-
ment “2”
90890-06320
Valve spring compressor adaptor
“2”
YB-06320
Valve spring compressor attach-
ment “2”
90890-06320
Lever assy “3”
90890-06956
Support assy 3 “4”
90890-06952
Valve spring compressor “5”
90890-06689
Valve spring compressor adaptor
“2”
YB-06320
Valve spring compressor “5”
YB-06689
B
4
2
4
5
3