(V) Assembly Of Cylinder Head - ATV 250 Service Manual

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(V) Assembly of cylinder head

1. Mount:
¡¤ Double end bolt ¢Ù
¡¤ Mount:
¡¤ Piston ¢Ù
¡¤ Piston pin ¢Ú
¡¤ Circlip ¢Û
Caution
¡¤ Arrow ¢Üon the piston must point to the for-
ward of engine
¡¤ Before mounting the piston pin, cover
Crankcase hole with cleaning towel or clothes
for avoiding circlip and other small parts drop-
ping into crankcase.
¡¤ Be sure to use new circlip.
3. Apply oil:
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¢Û
¡¤ Apply4-stroke machine oil on the piston pin,
piston ring groove and piston edge.
4. Installation of piston ring
Assembly the piston ring split clearance stag-
geringly according to showing figure.
¢ÙTop ring
¢ÚOil ring(lower ring
¢ÛThe second ring
¢ÜOil ring(up ring)
5. Install:
¡¤ Cylinder body washer ¢Ù
¡¤ Locating pin ¢Ú
¡¤ O-ring ¢Û
Caution
¢Ú
Be sure to use new sealing washer and o-ring
¢Û
Caution
¡¤ Be sure to check the standard of manufac-
ture and engraved figure on the ring. The mark-
ing surface is toward to piston top.
¡¤ Before mounting cylinder, apply a layer of 4-
stroke engine oil on piston ring.