XY400–2 Maintenance Manual
Inspection and adjustment
28
compressing stroke but exhaust/intake stroke. In this
case, continuously turn the flywheel clockwise for 360
degrees to the top dead center position of the
compressing stroke, where the valve clearance can be
adjusted. Afterwards, check the valve clearance by
inserting a clearance gage into the gap between
adjusting screw and the end of the valve.
The specified valve clearance is : 0.07-0.10mm for
intake valve and 0.08-0.12mm for exhaust valve
respectively.
If clearance adjustment is needed, loosen the locking
nut on the rock arm, turn the adjusting nut till a slight
resistance is felt on the inserted right clearance gage.
At the end of the adjustment, tighten the “Locking
out ”to prevent loosening and another check to make
sure that the valve clearance is OK before all those
dismounted caps are refitted on.
While adjusting, unscrew the retaining nut and then turn
the adjusting screw until you feel that the clearance
gauge is slightly pulled. Then secure the adjusting
screw using the valve adjusting tool
, and then
screw the retaining screw. And finally, check the valve
clearance.
6. Air
filter
Cleaning and replacement of air filter
Remove the left side covers Handle it carefully to
avoid scraping.
Remove 4 screws, remove Air filter cover
Description
1)
Remove the filter element and check whether it
is in normal condition. This is a paper filter
element, of which the surface can be cleaned
with compressed air; if the filter element is too
dirty, broken or damaged, replace it;
2)
While driving in a more dusty area, the time
period for cleaning and replacing air filter
element shall be shorter.
3)
Keeping the cleanness of the air filter may
improve the engine’s operating efficiency and
prolong its life span.
Air filter cover
Filter element
