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Repair instructions
7.22 Piston and cylinder – removal
1
Remove:
• cylinder cover
• carburettor (see “Carburettor – removal”)
• silencer
• spark plug
• fuel unit
If replacing the cylinder:
Remove the intake manifold, see “Air intake sys-
tem – removal”.
Cleaning and inspection
Clean all the components, scraping off all traces of
old gasket and carbon from the following places:
• Piston crown
• Top of the cylinder bore
• Cylinder exhaust port
• Decompression valve channel
• Cylinder base and/or crankcase
(see gure 56)
Fig 53
3
Cover the opening in the crankcase (see gure 54).
4
Remove the circlips from the ends of the gudgeon
pin and press it out. Then lift off the piston (see
gure 53 and 54).
5
Remove the little end bearing (see gure 54).
Fig 54
Fig 55
2
Undo the four cylinder bolts from the underside and
lift the cylinder off carefully (see gure 52).
Fig 56