English – 51
Repair instructions
Fig 74
Fig 75
10
Remove the screws holding the crankcase parts.
Carfully pull the crankcase halves apart. Two guide
pins keep the crankcase halves together. Lift out
the connecting rod with the piston. See Figure 74.
11
Use a at screwdriver to remove the circlips from
the gudgeon pin. Press out the gudgeon pin and lift
o the piston from the connecting rod. Remove the
gudgeon pin bearing using a plier and replace it
with a new one. See Figure 75.
Cleaning and checking
Clean all parts, and scrape o all gasket remains
and soot from the following components:
• The piston crown
• Top of the cylinder bore (inside)
• The cylinder exhaust port
• The base of the cylinder and/or crankcase
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.
• That the piston is free from cutting marks.
Minor scratches can be polished o using ne
emery paper.
• That the piston ring is not welded to its track.
• Remove the piston ring from the piston to
measure the wear. Use the base of the piston
to push the piston ring down into the cylinder.
The opening in the ring must not exceed 1 mm.
Put the piston ring back into the piston slot
and make sure it is the right way around. See
Figure 76.
Fig 76
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