7.10.2 To clean the cylinder and piston
CAUTION: Clean carefully. The soft aluminum
parts are easily damaged.
• Remove the carbon deposits from these parts:
a) The top of the piston.
b) The combustion chamber of the cylinder.
c) The exhaust port of the cylinder.
• Use a screwdriver to remove dirt particles from the
cooling fins.
• Clean all parts.
• Clean the piston ring groove.
7.10.3 To examine the cylinder
• Make sure that the surface layer of the cylinder is
not worn, especially in the top end of the cylinder.
• Make sure that the cylinder does not have score
marks.
7.10.4 To examine the piston
• Make sure that the piston ring can move freely in the
groove.
• Examine the surface of the piston for damage and
wear.
• Examine the piston pin. Refer to
To examine the
piston pin on page 28
.
• Examine the snap rings. If the snap rings have
cracks or discoloration, replace them.
• Measure the piston ring groove (A). Replace the
piston if the groove is larger than 1.6 mm.
• Measure the piston ring play (B). Replace the piston
ring if the piston ring play is larger than 0.15 mm.
1662 - 003 - 04.11.2021 Repair instructions - 27
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