Valve Clearance; Carburetor Idle Speed - KYMCO YUP 250 Manual

3
. INSPECTION/ADJUSTMENT

VALVE CLEARANCE

＊
• Inspect and adjust valve clearance while
the engine is cold (below 35℃ ).
Remove the met-in box ( 2-6 ) and center
cover. ( 2-7 )
Remove two nuts and four bolts on the
cylinder head.
Place the scooter on its side stand for remove
the cylinder head cover.
Turn the A.C. generator flywheel to the top
dead center (TDC) on the compression stroke
so that the "T" mark on the flywheel aligns
with the index mark on the left crankcase
cover.
Inspect and adjust valve clearance.
Valve Clearance: IN: 0.1mm
EX: 0.1mm
Loosen the lock nut and adjust by turning the
adjusting nut
Special
Valve Adjuster E036
＊
• Check the valve clearance again after
the lock nut is tightened.

CARBURETOR IDLE SPEED

＊
• The engine must be warm for accurate
idle speed inspection and adjustment.
Lift up the seat and remove the inspection
cover.
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: 1450±50rpm
When the engine misses or run erratic, adjust
the pilot screw.
www.PlanDeGraissage.org
Cylinder Head
Bolts
Cover
Nuts
Index Mark
"T" Mark
Feeler Gauge
Throttle Stop Screw
Pilot Screw
YUP 250
Oil Vapor
Recovery Tube
Top Dead Center Mark
3-6