Polini 107.0028 Instrucciones De Montaje página 9

cutting the initial part of the exhaust flange of 10mm.
KITS 119.0052-119.0055.
mill the branch pipe and be careful not to damage the base gasket face. (fig. I).
Spark plug: L78C Champion scale. Carburetion:
carburettor main jet
PHBG 19 AD
KITS 133.1007-133.1008.
tin wire. For the Ø 40,2 kits, you have to get a squish of 0,8±01. For the Ø 50 kits, the
squish must be 1mm±0,1. To get this datum, you can use the base gasket set of different
thicknesses provided with the kit.
Attention! Only for Ø 50 kits (see figure L) before assembling the engine, check that the
play between the piston and the crankcase (in the point indicated by the arrow) is of 1mm; if
not, remove some material from the crankcase. Carburetion: replace the main jet with a 86
one and the min. jet with a 50 one. Spark plug: as original or similar.
KIT 134.0316. Spark plug: L78C thermic grade on Champion scale.
KIT 134.0300. Carburetion: 78 main jet. Spark plug: L78C thermic grade on Champion scale.
KITS 140.0214-140.0188.
kits: to enlarge the hole of the spark plug passage on the dome, fit the new head, place the
dome and fit the spark plug key on the spark plug itself. Mark the zone to remove with a
drawing pen. Carburetion: increase the main jet of 2-4 points. Spark plug: RN2C Champion;
for sporting use, fit a C55 Champion spark plug. Reeds: the two provided reeds are of
different thicknesses, during the assembling, please remember to place the thicker one on
the flywheel side of the ignition.
KIT 142.0087/ST. Place the provided base gasket and mark with a scriber the zone to
remove with a miller to get a better gas flow. For all the models with a crankcase without the
rear branch pipe: mill the branch pipe and be careful not to damage the base gasket face
(fig. I). Spark plug: L78C Champion scale. Carburetion:
carburettor main jet
PHBG 19 AD
KITS 142.0100-142.0104.
new one. Then assemble the cylinder and the head. Check the tightness and lock the nuts
equally. Advance: as original, marked on the face of the flywheel.
Spark plug: L78C thermic grade on Champion scale.
For all the models with a crankcase without the rear branch pipe:
min. jet
88 48
Always check the squish between the head and the piston with a
Modification of the head-cylinder dome for air cooled cylinder
min. jet
94 48
Remove the valve lifter from the original head and fit it on the
atomizer needle
AN 262 W16
atomizer needle
AN 262 W16
gas valve ignition jet
40 60
gas valve ignition jet
40 60