VALVE CLEARANCE
(Fig. 22)
Adjusting screw
Fig. 23
3-WAY CATALYTIC CONVERTER (EP)
(Fig. 24)
3-way catalytic converter is mounted on the exhaust system of motorcycle.
It is designedto decrease contaminations such as CO, HC, NOx, etc. by redox
reaction to catalyst when the exhaust gases flow through the device.
Applying the catalyst controls the pollutant emissions from the motorcycle,
i.e. a chemical reaction sets in when exhaust gases pass through the converter
that contains a catalyst. The noble metal catalyst is characterised by good
adhesiveness, and accelerates a chemical reaction without itself being affected.
Its basic principle is as follow: pollutants in the exhaust gases, such as CO,
CH, NOx, etc. spread into micro-holes in the catalyst when gases pass
through the device, an adsorption reaction happens on the surfaces of catalyst,
as a result, converting them into harmless compounds (CO
2
, H
2
O, N
2
, etc.)
and entering the air. The purging efficiency of catalyst varies with tempera-
ture of, density of and speed of gases.
Attention should be drawn to the following points during service:
1. Handle 3-way catalyst with care, don’t knock or squeeze it, and keep
away oil and dirt. It should be stored in dry and well-ventilated place.
2. Never let acid liquid or electrolyte infiltrate into the exhaust muffler.
Otherwise, make the catalyst unefficient.
3. Unleaded gasoline should be used.
3-WAY CATALYTIC 3-WAY CATALYTIC
CONVERTER II CONVERTER
A D J U S T M E N T O F T I M I N G
CHAIN
(Fig. 23)
Start the engine and set its idle speed at 1400r/
min.
Turn the adjusting screw so as to apply a proper
tension to the timing chain.
EXHAUST MUFFLER (EP)
Clear away regularly carbon deposit in the exhaust
pipe; check the exhaust pipe inside for crack and
washer for damage, and repair or replace if neces-
sary
Check valve clearance when the engine is cold at the specified intervals.
Remove the view hole cap on the front-left cover, magneto cap and cylin-
der head cover.
Rotate the flywheel counterclockwise until mark T on the flywheel aligns
with the index mark on the view hole. Check it is in TDC of the compres-
sion stroke by moving the rocker arms. If they are free, it means check can
be done. Otherwise, rotate the flywheel through 360
.
Clearance should be 0.05mm for the intake and exhaust valves.
If it is necessary to make an adjustment, loosen the valve lock nut and turn
the adjusting screw so there is a slight resistance when the feeler gauge is
inserted. Then tighten up the lock nut, and recheck the clearance.
Mark T
Fig. 22
Index mark
Adjusting screw
Locknut
１００－Ｃ（ＥＮＧＬＩＳＨ）ＯＫ．ｐ６５
2012-9-12, 16:27
14
Summary of Contents for 100-C 2012
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