17
ENGLISH
operation hours (not supplied) (Standard operating temperatures: min.
55°, max. 90°). If you use the engine in cold weather conditions and
the water temperature does not reach the minimum one of 55° we
suggest you should install a thermostat with 60° opening (code
928.830.009). Eventually the EGT temperature can be checked using a
proper gauge at about 20cm from the cylinder (photo 12).
The EGT temperature detected in this position in standard conditions of
use should be around 500°-620°, maximum temperature 650°.
11- ENGINE FITTING ON THE FRAME
Fix the engine on the frame using the two h. 60 aluminium spacers
supplied which must be positioned in the bottom (photo 13). Fit the
spark plug on the head and the water connection with the two screws
and OR provided. Place the propeller mounting flange and secure it
with the supplied nut using a 19 bush and lock it with a torque wrench
to 60 N.m using medium threat seal. (Photo n.14)
Connect the fuel pipe to the tank. To prevent any residue of dirt ente-
ring the carburetor it is recommended to put a fuel filter (not supplied).
Furthermore connect a breather pipe from the reservoir system to the
tank. Rotate the filter case and fix it firmly to the frame using the hole
made on the outside.
COOLING SYSTEM
We recommend you should install the radiator in the higher side than
the cylinder (see assembly diagram A). Fix the big bracket supplied
between the two vibration-dumping mountings at the top and the fra-
me (see pic.15). Fit the two rubbers on the bracket and place the radia-
tor. To fix the radiator in the top side a bracket and a rubber are provi-
ded; the bracket has to be then connected to the frame using some
brackets (not supplied)
Using the special steel clamp place and fix the water charging bottle 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 (see
photo 16)
It is possible to place the radiator even in the bottom (see diagram B).
To facilitate the passage of the water tube on the head you will have to
use a special 90° connector - cod. 928.225.004 (not supplied) and if
the tubes should be too short purchase new ones: 16 x 23 tube no.
928.230.002; 4 x 6 tube no. 143.230.001; cod 6 x 9 no.928.230.004
pipe sold in 1 mt. long piece. In this case you should be very careful to
radiator position that must have a proper housing and a strong fixing.
Eventually place a breather pipe (928.225.006) where air bubbles
may start (see schedule B)
Fill the cooling system using coolant specifically designed for aluminum
radiators up to 1/2 of the water charge bottle. For the circuit with low
radiator let the air go out of the 90° breather placed on the head (see
photo 17) or from other air breather holes.
Check the level and proceed with the bleeding operation after having
run the engine for the first time that must be done by connecting the
choke wire to the carburetor. Connect the switch-off wire that comes out
from the coil to an earth-connected switch. Then start the engine for a
few seconds; stop the engine, check the level and if necessary top up
with liquid.
IMPORTANT WARNINGS
If for technical or constructional requirements the radiator has to be
mounted in a different location than those suggested, it is recommen-
ded the utmost attention to the passage of the water pipes that must
not have tight folds and they should not facilitate the formation of air
bubbles inside the cooling system. If so add some air breathers.
THOR 250 DUAL SPARK
The engine is supplied with all the electrical connections already enga-
ged. It is anyway necessary to fix on the engine the ignition box in a
proper position so that it does not suffer any vibration.
Connect all the red wires with eyelet to the battery positive pole and the
black cables with the eyelet to the negative battery pole. For any doubt
please refer to the attached electrical schedule.
TRACTOR CONFIGUATION
Thor 250 engine may be used in tractor configuration. In this configu-
ration 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 or on www.polini.
com).
11.1- ENGINE WITH ELECTRIC STARTER
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 that it is
necessary to switch the engine on.
11.2- FUEL SYSTEM
Prearrange the frame with a proper tank and its pump to let the fuel
reach the carburetor. Connect the fuel pipe to the manifold on the car-
buretor, fix it using a clamp and verify that there is no air coming in.
11.3- THROTTLE CONTROL
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 staying 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)
11.4- PROPELLER
The propeller is an essential component to ensure proper engine opera-
tion. 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.
Содержание Thor 250
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