Polini 107.0028 Instrucciones De Montaje página 10

KIT 142.0156. Spark plug: C53 Champion.
KIT 144.0150. For some engines it may happen that the cylinder collar does not enter the
crankcase smoothly. In this case, modify the crankcase as per figure M.
To achieve the best performance of this kit you have to align the ports of the crankcase
together with those of the cylinder. Carefully close the inlet of the crankcase with some
stopping and place the new base gasket. Mark with a scriber the zone to remove.
Take off the base gasket and go on with the alignment. Blow in a jet of compressed air,
remove the stopping and fill the crankcase with petrol. Make the crankshaft rotate and
remove the working residuals, blowing in a jet of compressed air.
Carburetion: Carburettor Bing 1/14/161, 70 main jet. Spark plug: L82C Champion.
KIT 146.0800. The 122-123 Rotax can be equipped with two different kinds of exhaust
valves: the first with mechanical control, the second with electric control. Our cylinder can be
assembled on both versions. If the pneumatic valve is installed, fit the provided nozzle in the
hole near the valve seat, to improve the pneumatic exhaust valve performance.
The outrigger of the nozzle inside the exhaust pipe has been optimized to work both with
the original muffler and with the Polini one. We recommend not to modify the mentioned
outrigger and not to fit exhaust systems that were not tested on our kit. If the valve with
the electric control is fitted, close the hole near the valve seat with the provided conical pin;
use a punch and a hammer to fit the valve in its seat. The original valve is used for both
the two models. Before the assembling, wash the valve with petrol. Fit the valve group on
the cylinder and check that the valve can move smoothly in its seat. To achieve the best
performance of the engine, it is worth to verify that the compression ratio corresponds to the
one we recommend. To allow this adjustment, the kit is provided with 3 base gaskets with the
following thicknesses: 0,5 / 0,8 / 1 mm. After having assembled the cylinder and the head,
bring the piston 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 threads.
The oil volume should be included between 13,3 and 13,7 cm
achieved, we suggest your replacing the base gasket, starting from the 0,5 mm one.
Each 0,1 mm of thickness corresponds to a volume variation of 0,28 cm
carburettor
PHBH28RD
VHSB34LD
ATTENTION: NOT GUARANTEED GOODS. By using high sophisticated instruments in
thermostatic chamber qualified technicians check the appropriate dimensions to establish the
main jet min. jet
130
158-155
. If this measure is not
3
atomizer
55 AV 264
36 original
. Carburetion:
3
needle
X56
K56