Spark Plug; Idle Speed; Drive Chain - Eton VECTOR ST 250 Service Manual

2.7 SPARK PLUG

This spark plug is located at the front of the engine.
Disconnect the spark plug cap and unscrew
the spark plug.
Check the condition of spark plug electrodes wear.
Change a new spark plug if the electrodes and
insulator tip appear unusually fouled or burned.
Discard the spark plug if there is apparent wear or
if the insulator is cracked or chipped.
The spark plug gap shall keep in 0.6-0.7mm
With the sealing washer attached, thread the
spark plug in by hand to prevent crosses threading.
Tighten the spark plug with 12-19 N.m

2.8 IDLE SPEED

Connect an engine speed meter.
Warm up the engine, 10 minutes are enough.
Turn the idle-speed adjust screw on the carburetor
to obtain the idle speed. "Turn in" (clockwise) will
get higher speed. "Turn out" (counter clockwise) will
get lower speed.
IDLE SPEED: 1700±100 rpm

2.9 DRIVE CHAIN

Stopping the ATV and shift the transmission into neutral(N) .
Measure the drive chain slack midway between the
sprockets.
Chain slack =15~25mm (5/8~1 inch)
Adjust the chain slack.
Loosen the lock nuts and turn drive chain adjusting nuts
until get the correct slack.
Tighten the axle holder bolts.
Torque = 90N.m (65 lbf.ft)
9