Adjusting The Engine Idling Speed; Adjusting The Throttle Cable Free Play - Yamaha WR250R Service Manual

NOTE:
Refer to "CAMSHAFT" on page 5-6.
G
Lubricate the camshaft bearings, camshaft
G
lobes and camshaft journals.
First, install the exhaust camshaft.
G
Align the camshaft sprocket marks with the
G
edge of the cylinder head.
Turn the crankshaft counterclockwise several
G
full turns to seat the parts.
f. Measure the valve clearance again.
g. If the valve clearance is still out of specifica-
tion, repeat all of the valve clearance adjust-
ment steps until the specified clearance is
obtained.
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9. Install:
All removed parts
G
NOTE:
For installation, reverse the removal procedure.
Note the following points.
10.Fill the coolant as specification, and then
check the coolant level.
EAS20590

ADJUSTING THE ENGINE IDLING SPEED

NOTE:
Prior to adjusting the idling speed, the air filter el-
ement should be clean, and the engine should
have adequate compression.
1. Start the engine and let it warm up until it
reaches the specified temperature.
2. Use a temperature probe tester "1" and con-
tact it to the drain bolt thread.
1
Oil temperature
60.0 °C (140.00 °F)
3. Install:
Digital tachometer
G
(Red/black ignition coil leads)
Digital tachometer
90890-06760
YU-39951-B
4. Measure:
Engine idling speed
G
Out of specification → Adjust.
Engine idling speed
1450–1650 r/min
5. Adjust:
Engine idling speed
G
MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
a. Adjust the engine idling speed by turning the
adjust screw "1" in direction "a" or "b".
1
Engine idling speed → Decrease
Direction "a"
Engine idling speed → Increase
Direction "b"
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6. Adjust:
Throttle cable free play
G
Refer to "ADJUSTING THE THROTTLE CA-
BLE FREE PLAY" on page 3-8.
Throttle cable free play
3.0–5.0 mm
Throttle cable free play (Cable free play at
G
surface of throttle grip flange)
3–5 mm
EAS20640
ADJUSTING THE THROTTLE CABLE FREE
PLAY
NOTE:
Prior to adjusting the throttle cable free play, the
engine idling speed should be adjusted properly.
1. Check:
Throttle cable free play "a"
G
Out of specification → Adjust.
3-6
ENGINE
a
b