Maintenance – Zenoah BK3420FL-EZ User Manual

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7. Maintenance

■ MAINTENANCE EVERY 100 HOURS (MA9) (MA10)
1. Remove the muffler, insert a screwdriver into the vent,

and wipe off any carbon. Also, wipe off any carbon at
the muffler outlet.

(1) Screwdriver (2) Muffler

2. Further tighten all screws, bolts and fittings.
3. Make sure that no oil or grease remains between the

clutch lining and the drum. If you see any there, wipe it
off using oil-free, lead-free gasoline.

4. Remove the float chamber of the carburetor, and

clean the inside of the float chamber.

(3) Float chamber

■ ADJUSTING THE ENGINE

Continued rotation of the blade after the throttle lever is

set to the idling position could be dangerous. If the

blade continues to rotate even after readjusting the

idling adjustment screw, the throttle lever, throttle wire,

or clutch might be faulty. Contact the shop where you

bought this product, and ask it to check and repair the

trouble.

• The idling engine speed is adjusted when this product

is shipped from the factory, but it might need to be
readjusted according to changes in operation
conditions (e.g. changes in the stability of the engine,
air density, etc.). When readjustment is necessary, try
to do so as described below. If this is difficult, contact
the shop where you bought this product, and ask it to
implement the readjustment.

• Make sure the throttle wire is parallel with the flexible

shaft. If the throttle wire is twisted, straighten it.

• If the flexible shaft is bent, the play of the throttle wire

changes. When you adjust the idling, bend the flexible
shaft and adjust the idling in a standing position similar
to the position in which you actually use the machine.

How to adjust the idling revolution speed

Warm up the engine at a medium speed for a few minutes

after starting it. Turn the idling adjustment screw on the

carburetor body using the screwdriver supplied as a

standard accessory, and adjust the idling revolution speed

to an appropriate value (when the throttle lever is returned

to its original position, the blade does not rotate, and the

IMPORTANT

WARNING

MA10

MA9

MA11

Increases

decreases