Service Manual

PERIODIC MAINTENANCE 2-7
Periodic Maintenance Procedures
Fuel System
NOTE
○
High and low idle speeds may vary depending on the
equipment on which the engine is used. Refer to the
equipment specification.
Low Idle Speed Adjustment
•
Disconnect all possible external loads from the engine.
•
Start the engine and warm it up thoroughly.
WARNING
Always keep your hands clear of the moving parts.
•
Move the throttle lever at a dash to the idle position.
•
Hold the throttle lever on the carburetor in closed position
(turn the governor arm clockwise all the way) and adjust
the low idle speed screw [A] until the engine idles at spec-
ified speed.
Low Idle Speed (Carburetor idle rpm)
1 450 r/min (rpm)
•
Release the throttle lever.
•
Loosen the locknut [A].
•
Adjust the low idle speed set screw [B] on the control plate
to obtain the specified governor low idle speed.
Low Idle Speed (Governor idle rpm)
1 550 r/min (rpm)
•
Tighten the locknut.
High Idle Speed Adjustment
NOTE
○
High idle speed adjustment should be made after the
idle speed adjustment is performed.
CAUTIO
N
Do not adjust high idle speed with the air cleaner
removed.
•
Start and warm up the engine thoroughly.