Section 2 Inspection And Maintenance Of Engine - ATV 200 Service Manual

Section 2 Inspection and Maintenance of Engine

1.Cylinder cover
1)Clean
.Carbon deposit
Use circular scraper
Caution
Please do not use sharp tool to avoid scraping
.Nut of spark plug
.Valve seat ring
.Bottom face of cylinder
2)Measure
.Flatness of cylinder cover bottom face
Recorrect the bottom face or replace if unquali-
fied
Flatness of cylinder bottom face is less than 0.
10mm(0.004in)
2.Intake and exhaust valve
1).Check
.Valve surface
.Valve rod end
Repalce it if it is worn, exfoliation corroded or
unqualifled
Min thickness (working limit)
0.8mm(0.031in)
Slope
0.05mm(0.020in)
Min length (working limit)
4.0mm(0.157in)
2)Check
.Valve rod end ¢Ù
Replace the valve, valve guide pipe and valve
rod oil seal if it is mushroom-shaped or its di-
ameter is bigger than other rod diameter.
Caution
Remove the deformation of valve rod end ¢Ù
by polishing the valve end with oilstone.
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