Idle Speed - BRP Johnson 4HP Service Manual

PERIODIC MAINTENANCE

IDLE SPEED

IDLE SPEED
INSPECT INITIALLY AFTER 10 HOURS (1 MONTH)
AND EVERY 200 HOURS (12 MONTHS) THEREAFTER.
Checking
1. Check the link mechanism and the carburetor throttle
valves for smooth operation.
2. Attach the tachometer cord to the spark plug high-tension
cord.

Engine tachometer
3. Start and warm up the engine.
NOTE:
Check and/or adjust the idle speed after the engine speed
has stabilized.
4. Check the idle speed.
Idle speed (in neutral gear): 1250 – 1350 rpm
Adjustment
If the idle speed is out of the specification, adjust the speed
as follows:
1. Turn the idle adjusting screw.
•
Turning clockwise:
The engine speed becomes higher.
•
Turning counterclockwise:
The engine speed becomes lower.
2-12
1. Idle adjusting screw