Specifications

47
6. Carburetor
6-7 Carburetor Adjustment
Before performing carburetor adjustment, the following areas must be inspected for good
working order.
● Correct spark plug set to specified gap must be installed.
● The air filter and paper filter must be clean and properly installed.
● The muffler spark arrestor screen and exhaust port must be clear of carbon.
● The fuel filter must be clean and properly installed.
● The carburetor and carburetor insulator block screw must be tight.
● The fuel must be fresh (properly mixed at 40:1 ratio with Zenoah or 50:1 ratio with RedMax)
● All standard air tubes (Air Pipes) must be installed.
● No fallen leaf or other matter must be adhered to the air intake.
Required Tools and Parts
● Carburetor adjustment screw driver 2.5mm flat tip
● Electronic digital tachometer
● Limiter cap removal tool
● New Limiter cap
Adjustment when engine activated
1. Start the engine and alternate three times between
the idling state (10 seconds) and full throttle state
(60 seconds). Then check the engine's condition.
2. If idling is not stable, remove the limiter cap (refer
to "6-4 Limiter Cap Removal/ Installation") and
adjust the engine according to the following
procedure.
● Throttle valve adjust screw
Clockwise (CW) 1&1/2 turn:
Increases engine speed.
● L-needle
Counterclockwise (CCW) 1/8 turn:
Enriches the fuel mixture.
(Reduces engine speed.)
● H-needle 【
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【USA/ HBZ2601 only】
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Counterclockwise (CCW) 1/8 turn:
Reduces engine speed.
3. Run the warm-up operation (see the above table)
and execute the rich down adjustment.
(Refer to "Rich Down Adjustment".)
Throttle Valve
Adjust Screw
1&1/2 turn
L-needle
1/8 turn
H-needle
【
【【
【USA/ HBZ2601 only】
】】
】
1/8 turn
Idling
Full
Throttle
1st Time 2nd Time 3rd Time