• Clean and examine the piston ring groove. It must
not be more than 1.6 mm.
• Examine the piston ring play. It must not be more
than 0.15 mm.
7.13.5 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.
7.13.6 To assemble the cylinder and piston
1. Lubricate the needle bearing with two-stroke oil and
put it into the connecting rod. Make sure that the
needle bearing moves freely in the connecting rod.
2. Install the piston. The arrow at the piston top must
be in the direction of the exhaust port. Push in the
piston pin and attach the snap ring.
Note: Always use a new snap ring.
3. Lubricate the piston and piston ring with two-stroke
oil.
4. Carefully attach the piston ring on the piston. Make
sure that you do not cause damage to the piston ring
or the piston.
1351 - 002 - 25.11.2020 Repair instructions - 37
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