Valve Clearance; Carburetor Idle Speed - KYMCO NEXXON 50 Service Manual

2
. INSPECTION/ADJUSTMENT

VALVE CLEARANCE

＊
Inspect and adjust valve clearance while
the engine is cold (below 35℃).
Remove the cylinder head cover.
Rotate the generator flywheel to locate the
camshaft on the top dead center (TDC) and
align the "T" mark on the flywheel with the
mark on the left crankcase cover.
＊
After adjustment, rotate the crankshaft
several turns to make sure that the valve
clearance is correct.
Inspect and adjust the valve clearance.
Valve Clearance: IN : 0.02mm
Loosen the lock nut and adjust by turning the
adjusting bolt.
Special
Tappet adjuster
＊
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.
Turn the throttle stop screw to obtain the
specified idle speed.
Idle Speed: 1700±100rpm
When the engine misses or run erratic, adjust
the air screw.
＊
When adjusting the carburetor, make
sure to use a E/M tester.
2-5
EX: 0.02mm
E012
Cylinder Head Cover
Bolts
"T" Mark
Air Screw
NEXXON 50
Throttle Stop Screw