8
2. 7 SPARK PLUG
This spark plug located at the front of the engine .
Disconnect the spark plug cap and unscrew the spark plug .
Check the spark plug electrodes for wearing .
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 一0 . 7mm .
With the sealing washer attached , thread the spark plug in
by hand to prevent crossing thread .
Tighten the spark plug with 1 . 2kgm
2. 8 IDLE RPM
Connect a 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 RPM 1550 士50rpm
2. 9 DRIVE CHAIN
When the drive chain becomes very dirty , it should be
removed , cleaned and lubricated by specify lubricator .
Using commercial chain lubricant to lubricate the drive
chain ,
Clean the drive chain with kerosene and wipe it dry .
Inspect the drive chain for possible wear or damage .
Replace the chain , if it is worn excessively or damaged
Inspect the sprocket teeth , if it is excessive wear or
damage , replace it .
