Cylinder Head Disassembly; Cylinder Head Check; Valve Spring Check - Yamaha Waverunner VXS VX1800 Service Manual

Cylinder head disassembly

1. Remove the valve lifters "1" and valve
pads "2".
TIP:
Write down the position of each valve lifter "1"
and valve pad "2" so that they can be installed
in their original positions.
1
2
2. Remove the intake valves and exhaust
valves.
TIP:
Write down the position of each valve, spring,
and other parts so that they can be installed in
their original positions.
1
2
Valve spring compressor "1"
90890-04019
Valve spring compressor "1"
YM-04019
Valve spring compressor attachment "2"
90890-04114
Compressor adapter "2"
YM-04114
3. Remove the valve seals.

Cylinder head check

1. Remove carbon deposits from the com-
bustion chambers.
2. Check the cylinder head water jacket.
Clean if there are mineral deposits or rust.
3. Check the cylinder head warpage using a
straightedge "1" and thickness gauge "2" in
the directions shown. Replace if out of
specification.
1
Warpage limit
0.100 mm (0.0039 in)

Valve spring check

1. Measure the valve spring free length "a".
Replace if out of specification.
5-47
Valve and valve spring
2