Yamaha pw80 - Manual (Page 23)

d. While running the engine at the specified
speed, check to see that the stationary
punch mark is aligned with the punch
mark. If the marks are out of alignment,
check to see that the woodruff key is
broken or flywheel assembly is out of
alignment.
Ignition timing: 20.6°/4,000 r/min
AIR FILTER CLEANING
The most critical aspect of routine maintenance
on a racing machine is proper air filter mainte­
nance. The air filter on a motocross must be
serviced after every practice session and moto
to ensure maximum engine performance and
life. For convenience, many racers prepare two
or three spare air filters ahead of time and simp­
ly switch filters between practices and motos.
Follow these instructions to service foam air
filters correctly:
1. Remove the cleaner case cap.
2. Pull out the element and guide from the
cleaner case cap.
3. Using uncontaminated cleaning solvent,
thoroughly wash the filter element; wash
it gently to avoid damage.
4. Squeeze the solvent from the filter ele­
ment.
CAUTION:
Do not twist or wring the filter element,
as it can easily be torn or otherwise dam­
aged.
5. Using liquid dishwashing detergent and
water, again wash the air filter element.
Rinse the element with water, squeeze it,
and allow the element to dry completely.
6 Pour a liberal amount of high-quality,
foam-air-filter oil into a plastic bag. Put
the filter element in the bag and thorough­
ly work the oil into the element.
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