Yamaha RS90RK, Service Manual

Page: 54 / 841

2-7
INSP
ADJ
COOLING SYSTEM/VALVE CLEARANCE ADJUSTMENT
• Install the coolant filler cap.
Apply and lock the parking brake. Start the
engine and run it at approximately 2,500 ~
2,700 r/min until the coolant circulates (approxi-
mately 3 ~ 5 minutes). The rear heat exchanger
will be warm to the touch.
WARNING
To avoid severe injury or death:
• Make sure the machine is securely supported
with a suitable stand.
• Do not exceed 2,800 r/min. Drive line damage
and excessive V-belt wear could occur, or the
machine could unexpectedly move forward if
the clutch engages.
• Operate the engine only in a well-ventilated
area.
• Remove the coolant filler cap and bleed the
cooling system again, as described above.
No air bubbles
→
OK.
• Pour coolant into the coolant reservoir 1 until
the coolant level reaches the “COLD LEVEL”
level mark
a
.
3. Install:
• Rear bumper cover
T
R
.
.
Rear bumper cover bolt:
4 Nm (0.4 m · kg, 2.9 ft · lb)
1
a
VALVE CLEARANCE ADJUSTMENT
NOTE:
• Valve clearance adjustment should be made on a
cold engine, at room temperature.
• When the valve clearance is to be measured or
adjusted, the piston must be at the top dead cen-
ter (TDC) on the compression stroke.
1. Drain:
• Coolant
Refer to “COOLING SYSTEM”.
2. Drain:
• Engine oil
Refer to “ENGINE OIL REPLACEMENT”.
3. Remove:
• Oil tank
Refer to “A.C. MAGNETO ROTOR AND
STARTER CLUTCH” in CHAPTER 5.