30/ENGINE - WORK ON INDIVIDUAL PARTS
128
301249-10
–
The cylinder size
is marked on the cylinder collar.
400376-10
–
Using a straightedge and the special tool, check the sealing area of the cylinder
head for distortion.
Feeler gauge (59029041100) (
Cylinder/cylinder head - distortion of
sealing area
≤
0.10 mm (
≤
0.0039 in)
» If the measured value does not meet specifications:
–
Change the cylinder.
19.19
Checking/measuring the piston
301217-10
–
Check the piston sliding surface for damage.
» If the piston sliding surface is damaged:
–
Replace the piston and, if necessary, the cylinder.
–
Check that the piston rings move easily in the piston ring grooves.
» If a piston ring exhibits excessive resistance:
–
Clean the piston ring groove.
Tip
An old piston ring can be used to clean the piston ring groove.
–
Check the piston rings for damage.
» If the piston ring is damaged:
–
Replace the piston ring.
Info
Mount the piston ring with the marking facing upward.
–
Check the piston pins for discoloration or signs of wear.
» If the piston pin shows severe discoloration/signs of wear:
–
Replace the piston pin.
–
Place the piston pin in the connecting rod and check the seating for play.
» If the piston pin seating has excessive play:
–
Replace the connecting rod and piston pin.
301216-10
–
Measure the pistons at the piston skirt, perpendicular to the piston pin.
Guideline
Piston - diameter (450 SX ATV)
Size I
96.960… 96.970 mm (3.81732…
3.81771 in)
Size II
96.971… 96.980 mm (3.81775…
3.8181 in)
Piston - diameter (505 SX ATV)
Size I
99.960… 99.970 mm (3.93543…
3.93582 in)
Size II
99.971… 99.980 mm (3.93586…
3.93621 in)
Info
Piston dimensions
are marked on the piston head.
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