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Engine Head Nuts
After the first 5 hours of operation, check that engine
head nuts are tight and equally torqued to 22
N.m i
16
tt-lbs) when cold.
Carburetor Adjustment
The carburetor adjustments are: Air Screw Adjustment,
Throttle Slide Adjustment and Idle Speed Adjustment.
Throttle slide
adjustment
Engine Mount Nuts
Check engine mount nuts for tightness. Retighten if ne-
cessary.
Check spark plug gap unsing a wire feeler gauge. Gap
must be 0.40 mm (,016"). Reinstall plugs and connect
wires. Correct spark plugs are Bosch W 340 S2S or
equivalent.
/:D-ll1I--
Cable adjuster
•
WARNING: It is important that the throttle slide
adjustment be performed to ensure proper func-
tioning of the throttle mechanism.
C) Idle speed adjustment
Turn idle speed screw clockwise until it contacts the
throttle slide then continue turning two (W) additional
turns. This will provide a preliminary idle speed setting.
Start engine and allow it to warm then adjust idle speed
to 3000-3500 RPM by turning idle speed screw clock-
wise or counter-clockwise.
. . , CAUTION: Do not attempt to set the idle speed by
... using the air screw. Severe engine damage can
occur.
A) Air screw adjustment
Completely close the air screw (until a slight seating
resistance is felt), then back off screw to specification.
S) Throttle slide adjustment
•
WARNING: Ensure the engine is turned OFF, prior
to the throttle slide adjustment.
With the throttle cable adjuster jam nut unlocked, press
the throttle lever against the handle grip. Unscrew the
cable adjuster manually to obrain maximum carburetor
slide opening. Check with your finger if the carburetor
slide is well seated against the carburetor top portion).
Then, screw the cable adjuster in two turns in order to
nullify any possible tension on the throttle cable then,
tighten the cable adjuster jam nut.
Fouled
Iblack)
Overheated
{light grey)
Exhaust System
The engine / exhaust system parts are vital toward effi-
cient muffler function. Check all attachments. Replace
springs and / or tighten if necessary.
. . , CAUTION: Do not operate vehicle with exhaust
... disconnected otherwise serious engine damage
will occur.
Spark Plugs
Disconnect spark plug wires and remove spark plugs.
Check condition of plugs.
• A
brownish tip reflects ideal condition (correct car-
buretor adjustment, spark plug heat range, etc.).
• A
black insulator tip indicates fouling caused by: car-
buretor idle speed mixture and / or high speed mix-
ture too rich, incorrect fuel mixing ratio, wrong type
of spark plug (heat ranqel, or excessive idling.
• A light grey insulator tip indicates a lean mixture
caused by: carburetor high speed mixture adjusted
too lean, wrong spark plug heat range, incorrect fuel
mixture ratio, or a leaking seal or gasket.
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