Polini THOR 303 Notice D'utilisation page 17

use the fuel tank during its carriage. Be careful of the petrol during the
carriage: its leaking may cause a fire.
! ATTENTION: During the carriage of the engine it is strictly recom-
mended to maintain the propeller locked together with its nut in order
to avoid that the flange thread that sticks out may be damaged or in
case of fall it might break the crankshaft.
The carburetor has a breather pipe studied to carry the engine when
lying. To empty the carburettor unscrew half turn the breather brass nut
(highlighted in photo 3 with an arrow) and wait till all the fuel enters
the tank. Tighten the brass connection again. Now the carburettor is
empty and you can lay the engine ready to be carried.
! ATTENTION: never unscrew more than half a turn the breather nut
to avoid damaging the OR seal. Never tight too hard.
9- ORDINARY SERVICING
! ATTENTION: THE SERVICING OPERATIONS MUST BE DONE
BY QUALIFIED PEOPLE ONLY. IF THE INSTRUCTIONS MENTIO-
NED BELOW WILL RESULT NOT CLEAR, WE SUGGEST ASKING
FOR SPECIALISTS BY POLINI MOTORI RETAILERS OR WHOLE-
SALERS. FOLLOW CAREFULLY WHAT DESCRIBED BELOW.
Maintenances and servicing necessary for the best set up of your engine
should be done regularly, or on all occasions before you start your en-
gine. All the tasks and adjustments described below can be done easily
by following the instructions given in this manual. Refer to your POLINI
MOTORI dealer for scheduled services and repairs, and insist that only
original spare parts are used to replace worn or broken components.
Refer to the servicing tables in sections 12 below for the frequency with
which the various servicing operations must be performed.
9.1- AIR FILTER CHANGE AND CLEANING
Dirty air filter is one of the most common causes of poor engine per-
formance.
Clean the filter periodically or change it. Remove the filter loosening the
clamps, unscrew the 2 screws using a cross screwdriver, remove the filter
cover and then the filter. Wash the filtering material with water and mild
soap. Dry the filter carefully, and then moisten it with oil for filters.
Clean filter box inside using a cloth and check the presence of foreign
bodies. Now reassemble all the parts. Wash the filter for maximum 2-3
times and then replace it with a new one.
! WARNING! If the filter becomes clogged with fine dust as well as
normal dirt, replace it with a new one.
! WARNING! Dirty air filter may compromise the correct operation
of the engine and it causes poor performance. Torn or broken filters can
allow dirt to enter the engine and cause rapid deterioration of the piston
rings, piston and barrel.
9.2- GEAR REDUCTION OIL CHECK
Operate when the engine is cold. Maintain the engine in vertical position and
remove the oil level screw on the transmission crankcase. (photo 4 – OIL
LEVEL). Check that the oil level reaches the lower edge of the level hole. If there
is too much oil, let it flow out from the hole until it stops flowing and collect
the oil in a suitable container. If there is not enough oil, top up as required
through the breather hole located at the top.
After checking it, tighten the screws. Use ELF Moto Gear Oil 10 W 40 ANTI Clutch
Slippage or Shell advance gear SAE 10 W 40 API GL-3
03
9.3- GEAR OIL CHANGE
Change the oil when the engine is cold. Unscrew the screw on the lower
side of the clutch/gear group (Photo 4-A).
A
Collect the oil flowing out in a suitable container. Wait till the oil has
completely flown out and, if necessary, tilt the engine to the side to
make this operation easier. Tighten the screw withy strength. Unscrew
the breather pipe in the top side of the crankcase (photo 5)
and fill it out with 100cc of ELF Moto Gear Oil 10 W 40 ANTI Clutch Slip-
page oil. Fit the pipe and its tube again. As an alternative you can use
also oil: Shell advance gear SAE 10 W 40 API GL-3 or an oil with 10W40
viscosity compatible with clutch (similar to motorcycle engine oil)
! WARNING! Do not throw spent oil into the environment. Dispose
of it correctly through authorized collection points.
15
04
OIL LEVEL
05
ENGLISH