Piston
To minimize the difference in expansion between piston
and cylinder the piston is made of a very special alloy.
Moreover the piston has a very specific shape.
Another advantage of this special alloy is that it is very
hard so gudgeon pin bores do not wear out.
When demounting piston, first remove pistonrings.
When reassembling the pistonrings be sure to put the
rings in the same piston ring groove as before.
Thereafter remove both circlips with a pair of pliers with
flat bits, and press gudgeon pin out of the piston.
Before reassembling the piston first check the gap of the
piston rings. See pict. 2.
Clean the ring grooves in the piston carefully before
assembling the rings.
Before assembling the piston, one of both circlips has to
be placed in the gudgeon pin bore. Always use new
circlips.
Push the gudgeon pin into the piston bore in such a way
that the pin protrudes inside the piston about 3 mm.
(.12").
Fit the piston on the connecting rod (first oil the little end
bush) and press the protruding part of the pin into the
little end bush.
Press the pin into the right position and fit the second
circlip.
Fit the piston rings in previous grooves.
Be sure that the arrow on the piston bottom points at the
exhaust port.
10.76
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