Shibaura FK500-A, Owner'S Manual

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5. Periodical inspections
(5) Change of fuel in tank
After the fuel is stored for a long time, it may deteriorate and not start the
engine smoothly. Sediment may attach to the carburetor and generate rust.
When the fuel has decreased down to the middle point of the specified fuel
level, replenish the fuel to prevent such troubles. Changing the fuel with new
one every 6 months is recommendable if the fuel decreases below that level.
○ Do not close the fire when replenishing fuel.

The fuel may catch the fire and explode.
(6) Cleaning the ignition plug
Use the ignition plug, NGK B7HS.
Clean the ignition plug when it is stained by exhaust gas or carbon.
A) Stop the engine and wait until it has cooled down sufficiently before
starting any work.
○
Do not touch the ignition plug or high-tension cord during operation.

You may get electrical shock.
B) Remove the plug cap and remove the ignition plug using a box spanner
for the ignition plug.
C) Clean the outside, inside and
electrodes of the ignition plug.
D) Adjust the gap of electrodes as
shown in the right figure.
E) Tighten the plug to the cylinder
head and push in the ignition plug cap.
(7) Inspecting the V belt
If the V belt has elongated, worn away or cracked, replace it with a new one.
A) Remove the recoil side cover.
B) Open the recoil starter.
C) Remove the belt from the
groove of the pulley.
D) Install a new belt into the
groove of the pulley.
E) Install the cover to the original
position.
Caution
Caution