Valve Clearance; Idle Speed Adjustment - KYMCO VENOX 250 Service Manual

2
. INSPECTION/ADJUSTMENT

VALVE CLEARANCE

Inspect and adjust valve clearance while
the engine is cold (below 35 ).
Remove the four cylinder head cover bolts
and the cylinder head cover.
Front cylinder:
Rotate the generator flywheel to bring the
camshaft to the top dead center on the
compression stroke and align the "T1" mark
on the flywheel with the mark on the left
crankcase cover.
Rear cylinder:
Rotate the generator flywheel for 270º
counterclockwise to bring the camshaft to
the top dead center on the compression
stroke and align the "T2" 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 : 0.1mm
EX: 0.1mm
Loosen the lock nut and adjust by turning the
adjusting bolt.
Special
Valve Wrench
Check the valve clearance again after
the lock nut is tightened.

IDLE SPEED ADJUSTMENT

1.Warm the engine up to 60 .
2.Remove the engine protector cover.
3.Insert both of vacuum gauges on the both
of vacuum holes.
4.Check the vacuum value of twin-cylinder
separately.
5.Adjust the differential vacuum within
20mm-hg.
6.Slightly turn the throttle grip for several
times and recheck if the differential
vacuum is within 20mm-hg. If within and
continue next step, If not within and
operate the step above again.
7.Adjust the idle speed to 1300±100rpm.
8.Slightly turn the throttle grip for several
times and recheck if the idle speed still stay
at the specific value. If rpm is at 1300 and
continue next step, If not and operate the
step above again.
2-13
Bolts
Lock Nut
Choke Rod
Vacuum Holes
VENOX 250