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30/ENGINE - WORK ON INDIVIDUAL PARTS
Checking/measuring the piston
19.19
–
The cylinder size
301249-10
–
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
»
If the measured value does not meet specifications:
–
Change the cylinder.
400376-10
–
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.
301217-10
–
Check the piston rings for damage.
»
If the piston ring is damaged:
–
Replace the piston ring.
–
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.
–
Measure the pistons at the piston skirt, perpendicular to the piston pin.
Guideline
Piston - diameter (450 SX ATV)
Size I
Size II
Piston - diameter (505 SX ATV)
301216-10
Size I
Size II
Info
Piston dimensions
is marked on the cylinder collar.
p. 229)
≤ 0.10 mm (≤ 0.0039 in)
Tip
An old piston ring can be used to clean the piston ring groove.
Info
Mount the piston ring with the marking facing upward.
96.960... 96.970 mm (3.81732...
3.81771 in)
96.971... 96.980 mm (3.81775...
3.8181 in)
99.960... 99.970 mm (3.93543...
3.93582 in)
99.971... 99.980 mm (3.93586...
3.93621 in)
are marked on the piston head.
128
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