3
. INSPECTION/ADJUSTMENT
Adjust by loosening the valve adjusting
screw lock-nut and turning the adjusting
screw until there is a slight drag on the
thickness gauge.
Valve clearance (when cold):
IN.: 0.1 mm (0.004 in)
EX.: 0.1 mm (0.004 in)
Apply oil to the valve adjusting screw lock-
nut threads and seating surface.
Hold the adjusting screw and tighten the
lock nut.
Special tool:
Valve adjusting wrench A120E00036
Torque: 0.9 kgf-m (9 N-m, 6.5 lbf-ft)
After tightening the lock nut, recheck the
valve clearance.
Install the removed parts in the reverse
order of removal.
CARBURETOR IDLE SPEED
*
The engine must be warm for accurate
idle speed inspection and adjustment.
Warm up the engine before this operation.
Start the engine and connect a tachometer.
Turn the throttle stop screw to obtain the
specified idle speed.
Idle Speed: 1500 100 rpm
When the engine misses or run erratic,
adjust the pilot screw (refer to the
"CARBURETOR
DISASSEMBLY/INSPECTION/
ASSEMBLY" section in the chapter 5).
Wrench Thickness
Gauge Valve Adjusting
Throttle Stop Screw
MXU 500
Lock Nut
3-12