13
ENGLISH
without accelerating and without using the starter. Now start the
engine and let it idle until it warms up to normal temperature
4 RUNNING IN
Run your engine in as instructed below to ensure that the engine
and transmission bed in correctly and to ensure continuous reliability
in future. Once the engine starts, leave it idling until it warms up to
normal temperature. We suggest running the engine 15 minutes at
medium-low engine power output gently accelerating and with diffe-
rent intensity. Now we suggest checking the correct idling calibration.
During the first flights or for the first 20 litres of petrol we suggest not
keeping the engine at the maximum rpm for too much time, conside-
ring that the 2-stroke engine doesn’t stand to the constant rpm even
if of medium power. We suggest varying the engine rpm. Check the
carburetion after the first landing. Repeat the running in every time
you change one of the following parts: piston, piston rings, cylinder,
crankshaft or main bearings.
5 ENGINE SWITCING OFF
Switch the engine off by pressing the button till the complete stop.
If the engine is equipped with the Polini throttle control the switch off
button is of red colour and you find it in the upper side; otherwise
refer to the frame/throttle’s manufacturer to find out the switch off
button.
6 CARBURETION
The carburetion setting must be executed by professional people only.
It is possible to make a fast analysis of the carburetion by checking the
spark plug colour. To do it, switch the engine off after having run it for
some second under charge.
Remove the spark plug unscrewing it with the proper tool and verify
the colour of the porcelain that must be of light-brown colour with
tendency to dark. A light colour of the spark plug electrode means a
lean carburetion; if you use the engine in these conditions may cause
the engine failure. Do not use the engine in these conditions and apply
to an authorized retailer to set it up.
IMPORTANT:
Walbro carburetors have a plastic seal that limits the
(H) screw regulation to ¼ turn. This is enough to adjust the engines in
the different conditions of use. By removing this seal the warranty on
the engine is no more valid.
7 CLEANING
Clean the engine when it is switched off and cold to avoid burns.
Clean the engine with a soft cloth soaked with neutral cleansing and
non-aggressive.
!
WARNING:
Do not use acids that may damage the engine, paint
and rubber parts.
8 CARRIAGE
!
ATTENTION:
Carry the engine only when it is cold. Follow the
frame manufacturer’s instructions for its carriage and how to use the
fuel tank during its carriage. Be careful of the fuel during the carriage:
fuel leaks may cause a fire.
The Walbro carburetor is sealed and if you tilt it the fuel does not leak.
For this reason, it is possible to tilt the engine in every position without
having any leakage of fuel from the carburetor.
9 ORDINARY SERVICING
!
ATTENTION:
THE SERVICING OPERATIONS MUST BE DONE BY
QUALIFIED PEOPLE ONLY. IF THE INSTRUCTIONS MENTIONED BELOW
WILL RESULT NOT CLEAR, WE SUGGEST ASKING FOR SPECIALISTS BY
POLINI MOTORI RETAILERS OR WHOLESALERS. 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 engine. 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 REMOVE AND CLEAN THE AIR FILTER
Dirty air filter is one of the most common causes of poor engine
performance.
Clean the filter periodically or change it. Remove the filter loosening
the clamps, unscrew the 4 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 being careful to place
correctly the 4 bars that maintain the filter in its position and tight
the 4 screws again. 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 INSTRUCTIONS TO STRETCH THE TRANSMISSION BELT
In order to grant longer life to the transmission belt a right stretch is
necessary.
In order to avoid wrong stretches the engine is supplied with a lever
rod of a fix length.
Proceed as follow: remove the propeller from the engine, unscrew
counterclockwise of ¼ of turn all the 4 M7 nuts that fix the fixing
plate of the pulley/gear. (Photo 2)
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