3. INSPECTION/ADJUSTMENT
3-9
MXU 300/250
Loosen the lock nut and adjust by turning
the adjusting nut
Special tool: Tappet adjuster E012
CARBURETOR IDLE SPEED
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: 1500±100 rpm
MXU 300: 1600±100 rpm
When the engine misses or run erratic,
adjust the air screw.
IGNITION TIMING
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
on the right crankcase cover.
The ignition unit is not adjustable. If the
ignition timing is incorrect, check the
ignition system.
＊
• The engine must be warm for accurate
idle speed inspection and adjustment.
＊
Throttle Stop Screw
Ai
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