Adjusting V-belt tension, Adjusting carburetor

Fig. 10

Fig. 9

After the saw works for a certain period of time, let the engine idle on for a while to dissipate the heat. This will prevent some engine parts (ignition system, carburetor, etc.) from being damaged by over heating.

ADJUSTMENT OF CUTOFF SAW

1. Adjusting V-belt tension:

Refer to the instruction described above in the section titled “Tensioning the V-belt.”

2. Adjusting carburetor:

The carburetor has been preset and adjusted at the factory to reach the optimum fuel-air mixture for a smooth, fuel efficient, reliable running engine with low emissions. The air

filter and the spark plug need to be checked and maintained regularly. However, if the cutoff saw is found to be unsatisfactory in operation (such as the idle speed either too high or too low, or abnormal exhaust emission still persist), a slight adjustment on the carburetor might be necessary, which includes (Ref. Fig. 9):

Standard setting adjustment:

Find the Low Speed Adjusting Screw “L” (see Fig.9, inside the upper hole of the carburetor seal cover), use a screw driver to turn the screw L clockwise all the way to its end. Then turn the screw L backwards (counterclockwise) 360°.

Adjusting idling speed:

It is usually necessary to adjust the idle speed after Standard setting adjustment (above). To adjust idle speed, start the engine first.

If the idle speed is too low, the engine may shut off after starting. In this case, make the standard setting first as instructed [above], then turn the idle speed adjusting screw LA (see Fig. 9) inside the lower hole of carburetor seal cover clockwise until the blade starts to run. Then turn the screw LA backwards (counterclockwise)

1/4 circle (90°).

If the idling speed is too high, the blade will run at idling speed, which is not good for the cutoff saw. In this case, make standard setting adjustment first, then turn the idling speed adjusting screw LA counterclockwise until the blade stops running. Then turn the screw

LA 90°further (counterclockwise).

3. Adjusting blade guard (Ref. Fig.10):

The blade guard deflects sparks from the operator. Move the adjusting lever (2) to change the position of the blade guard.

MAINTENANCE & REPAIR OF THE CUTOFF SAW

1. Cleaning and maintenance of the air filter

Dust and foreign build-up accumulated on the air filter may affect engine performance, increase fuel consumption and cause difficulty in starting; therefore, it is important to perform regular maintenance. The frequency of this depends on the conditions of the cutting jobs as well as

material being cut both wet or dry. For dry cutting, maintenance is required every 48 hours. For instructions, see Fig. 11.