3. INSPECTION/ADJUSTMENT ATV 50
CARBURETOR IDLE SPEED Throttle Stop Screw
· 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: 1800100 rpm
When the engine misses or run erratic,
adjust the air screw.
Air Screw
Ignition Apparatus
The CDI ignition timing is not adjust-
able. If the timing is incorrect, check
the CDI unit, ignition coil and A.C.
generator and replace any faulty parts.
Remove the A.C. generator fan cover.
( 8-3)
Remove the four bolts attaching the fan and
then remove the fan.
Warm up the engine and check the ignition Bolts
timing with a timing light.
Index Mark
When the engine is running at the specified
rpm, the ignition timing is correct if the "F"
mark on the flywheel aligns with the index
mark on the crankcase within 1.5°.
Ignition Timing:
MX'ER 50: 22°1.5°BTDC/2000rpm
MXU 50 REVERSE/MXU 50:
13.5°1.5°BTDC/1500rpm
"F" Mark
3-7
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