Adjusting Carburetor OP9, Chain Brake OP10

7. Operation

OP9

14 

■ADJUSTING CARBURETOR (OP9)

The carburetor on your unit has been factory adjusted, but may require fine tuning due to change in operating conditions.

Before adjusting the carburetor, make sure that provided are clean air/fuel filters and fresh, properly mixed fuel.

When adjusting, take the following steps:

NOTE

Be sure to adjust the carburetor with the bar chain attached.

1.H and L needles are restricted within the number of turn as shown below.

H needle –1/4

L needle –1/4

2.Start engine and allow it to warm up in low speed for a few minutes.

3.Turn idle adjusting screw (T) counter-clockwise so that saw chain does not turn. If idling speed is too slow, turn the screw clockwise.

4.Make a test cut adjust the H needle for best cutting power, not for maximum speed.

(1)L needle

(2)H needle

(3)Idle adjusting screw

■CHAIN BRAKE (OP10)

The chain brake is a device which stops the chain instantaneously if the chain saw recoils due to kickback.

Normally, the brake is activated automatically by inertial force. It can also be activated manually by pushing the brake lever (left-hand guard) down toward the front.

When the brake operates, a yellow cone pops up from the base of the brake lever.

Releasing the Brake

Pull the brake lever up toward the left-hand handle until it clicks into place.