48 - English
Repair Instructions
Check the following:
• That the cylinder’s surface coating is not worn.
Especially the upper part of the cylinder.
• That the cylinder does not have any chafe or
cutting marks. See figure 59.
• That the piston is free of score marks. Minor
scratches can be polished off using fine emery
paper.
• That the piston ring is not burnt into its groove.
Fig 60
• Measure the wear on the piston rings. This
must not exceed 1 mm. See figure 60. Use the
piston to push the piston ring downward.
• That the gudgeon pin bearing is intact.
• That the intake bellows is intact.
Cleaning and inspection of the cylinder
Clean all components, scrape off all gasket re-
mains and soot from the following areas:
• Piston crown
• Top of the cylinder bore (inside)
• Cylinder exhaust port
• Base of the cylinder and/or crankcase
Fig 59
4
Remove the circlips and press out the gudgeon pin.
Remove the piston. See figure 58.
5
Remove the gudgeon pin bearing (the needle bea-
ring) using a pliers. See figure 58.
6
Replace with a new bearing.
Fig 58
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