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Valve tappet clearance adjustment
Excessive valve tappet clearance will cause tappet noise,
and negative clearance will cause the valve damage and
low power.
Therefore, the valve tappet clearance should be maintained
properly. Perform the valve tappet clearance check at
initial 500km (300miles) and every 4500km (3000miles)
thereafter.
1 The valve tappet clearance must be checked when the
engine is cold.
Remove the point cover and tappet adjusting hole cap.
2 Rotate the flywheel counterclockwise until the “T”
mark 1. on the flywheel lines up with the timing index
mark 2. In this position, the piston
may either be on the compression or the exhaust
stroke. The adjustment must be made when the
piston is on top of the compression stroke when both
the inlet and exhaust valves are closed. This condition
can be determined by shifting the tappets with fingers
through the tappet adjusting holes. If the tappets are
free, it is an indication that the valves are closed and
the piston is on the compression stroke. If the tappets
are light and the valves are open, rotate the flywheel
360° and realign the “T” mark to the timing index mark.
Check the clearance of both valves by inserting the
0.05mm (0.002 in) thickness gauge provided in the
tool kit between the adjusting screw and the valve
stem.
If it is necessary to make an adjustment, loosen the
adjusting screw lock nut –3– and turn the adjusting
screw –5– so that the valve clearance will offer a slight
resistance when the thickness gauge –4– is inserted.
After completing the adjustment, tighten the adjusting
screw lock nut while holding the adjusting screw to
prevent it from turning. Finally, recheck the clearance
again to make sure that the adjustment has not been
disturbed.
Air filter service
When the filter is clogged with dust, it affects engine
performance and therefore, it should be cleaned
periodically. The air cleaner is a removable element type for
easy cleaning. Remove the air cleaner cover by loosening
air cleaner cover nut. Tap the element lightly and apply
compressed air from the inside of the air cleaner element.
16


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