Polini THOR 303 Notice D'utilisation page 20

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Fit the two rubbers on the bracket and place the radiator. To fix the
radiator in the top side a bracket and a rubber are provided.
Using the special steel clamp place and fix the expansion tank at least
50 mm. above the radiator. Cut to size the water pipes and mount them.
Close the supplied clamps using special pliers for its fitting (photo 16).
It is possible to place the radiator even in the bottom (see exploded view
B). To facilitate the passage of the water tube on the head you have to
use a special 90° connector - cod. 928.225.004 and 928.225.006 (not
supplied). In this case you should be very careful to the position of the
radiator that must have a proper housing and a strong fixing. Eventually
place a breather pipe (928.225.006 and 928.225.004) to avoid air
bubbles may start (see exploded view B)
Fill the cooling system using coolant specifically designed for aluminum
radiators up to 1/2 of the expansion tank. For the circuit with low
radiator let the air go out of the breathers.
Check the level and proceed with the bleeding operation after having
run the engine for the first time . Then start the engine for a few
seconds; stop the engine, check the level and if necessary top up with
some liquid.
IMPORTANT WARNINGS
If for technical or constructional requirements the radiator has to be
mounted in a different applications than those suggested, it is recom-
mended the utmost attention to the passage of the water pipes that must
not have tight folds and they should not facilitate the formation of drain
pipes. If so add some air breathers.
11.1- THOR 303 DUAL SPARK
The engine is supplied with all the electrical connections already enga-
ged. Connect all the wires with red eyelet to the positive battery pole
and the black ones to the negative battery pole. Please refer to the
attached electrical schedule.
ENGLISH
TRACTOR CONFIGUATION
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Thor 303 engine may be used in tractor configuration. In this con-
figuration the standard vibration-damping rubbers cannot stand the
correct engine mounting. For this reason there is a special plate (cod.
928.004.002) which grants the right connection of the engine with
tractor configuration. This plate requires different connection points on
the frame (drawing available on www.polinithor.com).
11.2- ELECTRIC STARTER (single-ignition model)
Firmly fix the battery which is supplied already charged (anyway we
suggest you should charge it one time before using it). Connect the relay
to the frame. Connect the two red cables to the battery positive pole, the
black cable to the negative pole while the yellow/green cable must be
connected to a NA switch (normally open) to earth which it is necessary
to switch the engine on.
11.3- FUEL LINE
The engine is supplied with fuel pump and manual pump already con-
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nected. Prearrange the frame with a proper tank and fuel filter. Connect
the fuel pipe to the union on the manual pump and fix the fuel line
properly and safely and verify that there is no air coming in.
11.4- THROTTLE (single-ignition model)
Fix it to the carburetor by using the proper support (not supplied). After
assembling the throttle control, check that its travel is enough to reach
the carburetor throttle valve opening and check that recovery is good in
order to avoid the engine remaining accelerated. Connect the electrical
wires of the throttle, one on the mass wire of the coil and the other on
the + of the coil (female connector)
11.5- PROPELLER
The propeller is a key component to ensure the proper engine operation.
For this reason it is a must to use Polini Motori propellers only.
The use of a no-proper propeller may compromise the engine working
and make the guarantee null.
Instructions to fix the propeller flange
! CAUTION: tight the propeller flange following carefully the se-
quence below.
- Place the flange matching it to the rows of the gear shaft with the
projecting side toward the engine
- Place the centering nut with left threat and hand-screw it till the end
on the flange. (the nut will be tightened at all at a later stage)
- Place the propeller, the plate and the 6 M8 screws, hand-screw the 6
crews without tightening them at all but leaving them unscrewed just a
little bit. (about one turn less before the first beat).
- Tighten the centering nut at 80Nm counter clockwise.
- Finish the mounting by tightening the propeller screws crosswise (fol-
low the propeller manufacturer's instructions about the proper tighte-
ning torque) ! CAUTION! Before each flight always check that the
propeller screws and centering nut are firmly tightened.
11.6- GEAR REDUCTION
Thor 303 engines are available with 1-2.8 or 1-3.2 gear reduction.
1-2.8 reduction is ideal for 140cm max propeller diameter
1-3.2 reduction is ideal for 160cm max propeller diameter