Polini 107.0028 Instrucciones De Montaje página 7

transmission gears by substituting the gear set and/or the sprocket - gear set.
Attention: silencers and exhaust systems which have been modified to replace the original
ones need a specific carburator's setting up to work in the correct way. Different calibrations
which can pointedly move away from the data and jets we recommended.
If you decide to fit other Polini products together with the cylinder kit, please look up in our
catalogues or visit our web site www.polini.com.
RUNNING IN - During the first 500 Km don't exceed the ¾ of the accelerator opening and
avoid covering long upward runs putting with engine under strain.
GENERAL SUGGESTIONS - Both during the running-in and after never try getting the
highest power before achieving the best running temperature. The bedding of the various
parts will be obtained after an average of about 500 km. We suggest a careful setting up of
the engine, the carburettor and the variator. This kit has been studied for extreme perfor-
mance at high revolutions. A wrong calibration could compromise the engine performance.
We suggest your using original Polini Motori spare parts only.
KIT 107.0028. Remove the bearing and the oil seal from the original cylinder, using a Ø9,5
drift (fig. B); fit the original bearing and the oil seal (provided) in the Polini cylinder, using
the provided clamp (fig. C). Modification to the valve guide clamp (fig. D): lower the clamp
till the dimension of 8,5mm. Insert the provided valve and check that the "A" and "B"
surfaces are perfectly aligned. Fit the valve, with the datum line upwards.
Attention: some of the 1987 models fit the 1988 version valve: you have to buy the right
Polini valve (you can detect the right diameter, measuring the diameter of the stem. Fig. D).
Cagiva C9, stem Ø7,9 - Cagiva C10, stem Ø 9,4. For kit Cagiva C9: insert the provided screw
(M5x27) in the valve cover, as indicated per figure E.
Modification of the head dome (fig. F): turn the dome head up to Ø 62. Choose among the
provided gaskets the appropriate one, measuring the thickness of the original base gasket.
Place the gasket on the crankcase surface, fit the cylinder, insert the O-rings in the head
and assemble the head itself. Compression ratio: as soon as you have done the assembling,
without the exhaust system and the spark plug, bring the piston up to the top dead centre
(T.D.C.) and inject, using a graduated syringe, some oil in the spark plug hole; fill the
combustion chamber, including the spark plug hole thread. The oil volume should be included
between 14,4 and 14,6 cm (the oil volume changes depending on the spacer you are using;
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each tenth of thickness makes the volume oil increase by 0,32 cm ). Modification of the
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head dome (only for Mito, fig.G): modify the original head as per figure. Place the head on
a reference surface and verify that the head volume is of 17,6±0,1 cm , including the spark
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plug threads. If the requested volume is not achieved, vary the R11 mark till you achieve