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abrasive paste designed for
grinding valves.
To improve the performance
of the engine, it is advisable
to perform a perfect jointing
and finishing of the intake and
exhaust lines.
The best intake line is a line
tending to narrow slightly from
the carburettor valve on to the
intake valve with a maximum cam
angle of 2°.
At the same time, it should not
have any protuberances of any
type (edges, expansions or abrupt
narrow points). Thus, the jointing
must be carried out perfectly.
The best exhaust line diverts
slightly starting from the exhaust
valve (with a maximum opening
angle of 2°). No protuberances of
any type are present.
Therefore, it is perfectly jointed
in all sections up to the exhaust
silencer. In this case as well,
there must not be any abrupt
reductions in passage or
increases in the passage sections.
General care
Every time the cylinder kit is
disassembled, replace the head
and cylinder bottom gaskets with
a new series in order to guarantee
a perfect seal.
Never demand maximum
performance from the engine
until it has reached its optimum
working temperature.
Control often the oil circuit of
the engine, the oil level, and the
oil quality.
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Technical features
Cylinder
3117559: Bore: Ø 61 mm; Stroke:
57.9 mm; Displacement: 169.2
cc; Compression ratio: 11.7:1.
3117560: Bore: Ø 61 mm; Stroke:
57.9 mm; Displacement: 169.2
cc; Compression ratio: 11.4:1.
• Material: primary aluminium
alloy with a high content
of hardened and tempered
silicon, cylinder liner with
silicon carbide coating in
a galvanic nickel die and
crossed smoothing with two
diamond passages with very
limited tolerances.
• Machining: on machine
tools with high precision
numerical control.
• Cylinder-piston connection
with an allowance of 0.05 mm.
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