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3. INSPECTION/ADJUSTMENT MXU 250R/300R
Valve Wrench
Loosen the lock nut and adjust by turning
the adjusting nut
Special tool: Tappet adjuster E012
· Check the valve clearance again after
the lock nut is tightened.
Round Hole
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:
MXU 250: 1500100 rpm
MXU 300: 1600100 rpm Air Screw Throttle Stop Screw
When the engine misses or run erratic,
adjust the air screw.
IGNITION TIMING Timing Hole Cap Index Mark
The ignition unit is not adjustable. If the
ignition timing is incorrect, check the
ignition system.
Remove the timing hole cap.
Check the ignition timing with a timing
light.
When the engine is running at idle speed,
the ignition timing is correct if the "F" mark
on the flywheel aligns with the index mark Timing Hole
on the right crankcase cover.
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