. Set the choke lever to
. Pull the filter cover lock lever (7) backward to let the
filter cover (1) swing open. Then take out in succession pre-
filter (2), pre-filter (3), filter housing (4), paper air filter (5),
and the secondary filter (6). Then clean and dry all these
parts. Replace if any are damaged. Finally replace all of
them in succession and close the filter cover.
. Maintenance of spark plug (Ref. Fig. 12):
Wrong fuel mixture (too much engine oil in the gasoline),
low quality gasoline or oil, dirty air filter, clogged spark
arrestor screen, and other unfavorable running conditions
affecting the condition of the spark plug as they cause
deposit accumulation, which results in trouble in engine
operation. Therefore, if the engine is down on power,
difficult to start or runs poorly at idling speed, first check
the spark plug.
. Remove the spark plug cover (2) on the front end of the
main cover (1).
. Remove the plug boot (3) and the spark plug (4) in
. Clean off the carbon build-up on the spark plug.
. Check electrode gap A to see if it is 0.020": readjust if necessary.
. Replace spark plug after approx. 100 operating hours, or earlier if the electrodes are badly
eroded. (A BPMR7R-type spark plug is recommended for replacement.)
. Refit the plug boot and make sure it is snugly connected to the spark plug.
. Replacing starter rope (Ref. Fig. 13):
The starter rope may need to be replaced when frayed or broken.
. Unscrew the screws (2) on the flywheel/starter cover (1) and remove the cover from the engine
. Remove the spring clip (8), remove the rope rotor (7) with pawl (9).
. Using a screwdriver, unscrew the screw plug (3) on top of the starter grip, remove the starter
rope (4) out of the grip.
. Put a new rope down through the grip and the rope guide bushing (5), make a simple knot at
the end of the rope and screw in the screw plug (3)
. Thread the rope through the rope rotor (7) (enter from the hole on the rotor groove) and secure
it with a simple knot.
. Wind the rope around the rope rotor (7) clockwise until there is a length of about 12" left
. Slip the rope rotor onto the starter post (6) and turn it back and forth a little until the anchor
loop of the rewind spring engages.
. Replace the pawl (9) in the rope rotor.
. Press the spring clip (8) onto the starter post and over the peg of the pawl with a screwdriver.
Note: The spring clip must point counterclockwise.