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Carburettor Adjustment
Victa recommends only a trained service technician should attempt to adjust the
carburettor
Carburettor Essentials
The chainsaw carburettor has been factory adjusted to suit this unit but may require fine
tuning due to operating conditions.
Before adjusting the carburettor, make sure the air filter and fuel filters are clean. Also make
sure the correct fuel mixture is used. If any of these items need changing it is recommended
to change these first and check to see if these changes resolve the issue.
The bar and chain must be attached and correctly tensioned before making any changes.
Adjusting the Carburettor
1. Stop the chainsaw and allow the unit to cool.
2. Screw both the H needle (1) and the L needle (2) anti-clockwise until they stop, never force
the needles they should move freely but firm.
3. Set each needle the correct amount of turns
- H needle (1) = 1 & 1/2 turns
- L needle (2) = 1 & 1/4 turns
4. Start the engine and allow it to warm up at 1/2 throttle position
5. At idle turn the L needle (2) slowly clockwise until the engine idle is at maximum rpm,
then turn the L needle (2) 1/4 anti-clockwise.
6. Adjust the Idle adjustment screw (3) accordingly.
- Anticlockwise will reduce idle rpm
- Clockwise will increase idle rpm (chain should not move during idle, if so reduce rpm)
7. Make a test cut and adjust the H needle (1) for best cutting power, not for maximum rpm.
(1) High RPM needle
(2) Low RPM needle
(3) Idle adjustment screw
1.
2.
3.
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