Checking The Cylinder Head Anode; Assembling The Cylinder Head - Yamaha F30B 2018 Service Manual

2. Check:
• Spark plug
Electrodes are eroded, edges of elec-
trodes are rounded, insulator is damaged,
or there is carbon or other deposits.  Re-
place.
3. Measure:
• Spark plug gap "a"
Out of specification  Adjust or replace.
Spark plug (NGK)
DPR6EB-9
Spark plug gap
0.8–0.9 mm (0.031–0.035 in)

Checking the cylinder head anode

1. Check:
• Anode
Eroded (1/2 or more)  Replace.
There is grease, oil, or scales.  Clean.
Do not apply grease, oil, or paint to the an-
odes.

Assembling the cylinder head

1. Install:
• Valve stem seal "1"
a
New
1
2. Install:
• Intake valve
• Exhaust valve
• Valve spring seat
• Valve spring
• Retainer
• Valve cotter
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Install the valve "1", valve spring seat "2",
valve spring "3", and valve spring retainer
"4" in this order, and then install the valve
spring compressor "5" and valve spring
compressor attachment "6".
4
3
2
Valve spring compressor "5"
90890-04019
Valve spring compressor "5"
YM-04019
Valve spring compressor attach-
ment "6"
90890-06320
Valve spring compressor adaptor
"6"
YB-06320
7-41
Camshaft and valve
6
5
1