Yamaha RS90GTZ Service Manual page 35

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VALVE CLEARANCE ADJUSTMENT

For each cylinder, starting with cylinder #3 at

TDC, turn the crankshaft clockwise as specified

in the following table.

Degrees that the crankshaft is turned clockwise

Combustion cycle

• Intake camshaft

• Exhaust camshaft

• Refer to "CAMSHAFTS" in CHAPTER 5.

• When removing the timing chain and cam-

shafts, fasten a wire to the timing chain to

retrieve it if it falls into the crankcase.

• Valve clearance

Adjustment steps:

• Remove the valve lifter

with a valve lapping tool (valve lapper)

Valve lapping tool:

Valve lapper:

• Cover the timing chain opening with a rag to

prevent the valve pad from falling into the

• Make a note of the position of each valve lifter

and valve pad

installed in the correct place.

and the valve pad

so that they can be

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