Specifications

49
6. Carburetor
Rich Down Adjustment
1. Turn the idling limiter (L-needle) clockwise to the
position of maximum engine speed.
2. Turn the throttle valve adjust screw in either
direction to match to the regulated ID peak speed.
(Refer to "6-1 Specifications- ID Peak Engine
Speed".)
3. Turn the L-needle counterclockwise and execute
the rich down adjustment.
(Refer to "6-1 Specifications- ID Rich Down".)
4. Turn the throttle valve adjust screw in either
direction and set the ID speed.
(Refer to "6-1 Specifications- Set ID Engine
Speed".)
5. Check that rotational speed accelerates normally
between idling state and full throttle within the
regulated number of revolutions.
(Refer to "6-1 Specifications- Standard Engine
Speed".)
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【USA/ HBZ2601 only】
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After the above adjustment is completed, adjust the
H-needle.
1. Turn the H-needle clockwise so that the speed
reaches its peak (7300 to 7800 rpm).
2. When the speed reaches its peak, turn the
H-needle counterclockwise until the speed falls 50
to 100 rpm. (Set H Engine Speed: 7300 rpm)
The HBZ2601 rich down procedure might not
optimize the L-needle and H-needle
relationship at first try.
If so repeat this procedure twice.
Throttle Valve
Adjust Screw
L-needle
H-needle
Rich Down:
Adjust the idle needle to a slightly richer mixture in order
to maintain a stable idling speed and get a good
acceleration.
Peak engine speed
Set engine speed
Peak
Rich Down
Best
Consumption (ℓ/h)
(rpm)
REFERENCE