Checking The Timing Chain Tensioner; Installing The Camshafts - Yamaha YZF-R25 Service Manual

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Table of Contents

a. 1/4 tooth

1. Timing chain

2. Camshaft sprocket

CHECKING THE TIMING CHAIN TENSIONER

• Timing chain tensioner

Cracks/damage/rough movement → Re-

a. Lightly press the timing chain tensioner rod

into the timing chain tensioner housing by

While pressing the timing chain tensioner rod,

wind it counterclockwise with a hexagon wrench

"1" (Part No.: 1WS-12228-00) until it stops.

b. Make sure that the timing chain tensioner rod

moves in and out of the timing chain tension-

er housing smoothly. If there is rough move-

ment, replace the timing chain tensioner.

• Marks "a" on the generator rotor

(with the slots "b" in the generator rotor cover)

• Punch mark "c" on the balancer drive gear

(with the projections "d" on the timing chain

guide (lower side))

a. Turn the crankshaft counterclockwise.

b. Position the marks "a" on the generator rotor

on both sides of the slots "b" in the generator

rotor cover.

c. Position the punch mark "c" on the balancer

drive gear "1" between the projections "d" on

the timing chain guide (lower side) "2".

• Intake camshaft sprocket "1"

• Exhaust camshaft sprocket "2"