32
CARBURATOR ADJUSTMENT KEIHIN
Idle mixture adjusting screw c) is used to adjustment richness of fuel/air intake engine. The adjustment
could be necessary when the elevation (meters from level sea) or the weather temperature changes enough
to feel variations on the performance on engine.
If ADJUSTING is needed, first counting the position of the screw the bike uses and write it down on a sheet
the current settings. In order to avoid damage the cone screw, don’t thigh strong on the closed position.
The standard setting from factory is 1 ½ anticlockwise from the closed position (full clockwise).
If the factory setting is not adequate and you need to adjust it, follow these steps:
Get the bike warmed up. With the engine runs turn
the screw slightly (no more than 5 minutes) each
time in the direction required:
Direction:
•
The idle mixture adjusting
- Clockwise:
Less turns out = less air into the pilot circuit = riche-
ning it.
- Anticlockwise:
More turns out = More air = leaning it.
Allowing 15-20 seconds between turns for the en-
gine to "catch up" to each new fuel/air setting. Few
rotation make high difference.
•
Throttle valve adjusting screw.
When the idle mixture adjusting is in correct point,
then is time to adjust the idle engine.
- Clockwise: Increase the engine rpm.
- Anticlockwise: Decrease the engine rpm.
27 - Carburator adjustment of the idle speed
b
c
