Polini THOR 190 EVO L'utilisation Et L'entretien page 16

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9.3- ADVANCE TIMING SETTING - FOR MODELS WITH
ALUMINUM FLYWHEEL ONLY (WITHOUT ELECTRIC
STARTER)
WARNING: This adjustment is necessary only if the ignition is
disassembled and it must be done by qualified people only owning
the necessary tools.
Screw one m.5x30 screw in the hole with thread passing through the
flywheel and lock it. Assemble the flywheel and insert the screw in the
case: the flywheel will be fixed (Photo 5). Screw the flywheel nut
without locking it so that the crankshaft can rotate in the flywheel.
Screw the comparator support into the spark plug hose, house the
comparator and move the piston to the top dead centre. Now reset the
comparator and rotate the crankshaft ant-clock wise of 1,2 mm
towards the flywheel sense (see arrow in photo 6). Once achieved the
value, keep the pulley or the crankshaft stopped using one hand and
tight the flywheel nut using a key, without exceeding.
Check that the advance timing is as indicated (1,2+/- 0,1), remove
the m.5x30 screw and fit the coil. Before locking it with the 2 screws,
place between coil and flywheel one 0,35 mm calibrated shim (photo
7). Now definitely tight the flywheel nut using a torque wrench at
40Nm (photo 8).
9.4- STARTER ROPE REPLACEMENT (Flash Starter)
Remove the starter from the engine unscrewing the 4 screws (Photo
9). Remove the handle rope. Be careful since the central wheel will
turn till the spring is completely discharged: keep it and discharge it
slowly to avoid damages or possible injuries. Remove the central
screw and its cover (photo 10).
Attention! Under the cover there are two teeth for the starter
jaw (check their condition and if worn replace them); under them 2
small calipers. Be very careful not to lose these small parts.
Prepare the new rope and tie a knot at the top. Remove the plastic
wheel and the old rope. Thread the new rope in its hole (photo 11),
wind the rope on the wheel (according to the entrance sense of the
rope on the wheel) (Photo 12). Now insert the plastic wheel in its
housing again, and check through the hole that the internal spring
hook is perfectly coupled (Photo 13), place the springs, the teeth for
the starter jaw and screw the cover again using medium thread-locker.
All the parts in movement, including the springs, must be well
lubricated.
Now go on by charging the return spring: take the head of the rope
leaving 10-20 cm coming out the hole with "u" shape on the wheel
side. Turn the wheel three times in counter clock-wise sense till it stops
in front of the exit hole on the aluminium case. Keeping the plastic
wheel stopped, pass the rope through the case hole. Insert the handle
and the washer and tie a single knot as shown in photo 14.
ATTENTION: verify that the return spring does not reach the end
of the stroke. Pull the rope completely and turn the wheel again to
check that it can make at least one turn before stopping.
This test is very important because the spring hasn't been studied to
reach the end of the stroke and, if it happens, the spring will break.
Reassemble the starter in the engine and tight the 4 screws (M5) with
ENGLISH
strength (see the tightening torque values table).
9.5- STARTER ROPE REPLACEMENT (STANDARD STARTER)
Remove the starter from the engine unscrewing the 4 screws (Photo
9). Remove the old rope. Be careful since the central wheel will turn
till the spring is completely discharged: keep it and discharge it slowly
to avoid damages or possible injuries. Prepare the new rope and tie a
knot at the top. Remove the old rope and keeping with a hand the
outside area, make the inside part rotate anticlockwise for 5 laps.
Stop it when the hole of the inside wheel is in correspondence of the
outside hole (photo 15). Now take the new rope and insert the head
of the rope (the one without knot) in both the holes simultaneously.
Make the rope pass completely till the knob reaches the end. Be
careful not to release the rope and let the spring pull the rope back
and wind it up on the internal wheel. Now make the free head of the
rope pass through the handle and make a simple but strong knob.
(photo 14).
Reassemble the starter in the engine and screw the 4 M5 screws with
strength (see the tightening torque values table). Check the picklocks
wear and, if necessary, replace them unscrewing the central screw.
After replacing them tight the central screw again using medium
thread locker.
ATTENTION: verify that the return spring does not reach the end
of the stroke. Pull the rope completely and turn the wheel again to
check that it can make at least one turn before stopping.
This test is very important because the spring hasn't been studied to
reach the end of the stroke and, if it happens, the spring will break.
Reassemble the starter in the engine and screw the 4 screws (M5)
with strength (see the tightening torque values table).
10- HOW TO BEHAVE WHEN FLYING
Maximum acceleration is recommended only to take off (full power)
or when really necessary!
In order to avoid a poor mixture from acceleration/ascent to level
flight conditions, loosen the engine till a descending phase and then
gradually accelerate again till achieving a level flight or a glide angle
or a rise angle wished. In this way you will be sure to maintain firm
and efficient the carburation, avoiding being over rpm with a
minimum valve/throttle opening.
We remind you that two stroke engines do not stand constant range
for a long time too much. Take care of your engine by varying now
and then the rpm range. In this way the engine will have constant
performance and a good elasticity improving its working during the
time.
10.1- TEMPERATURE THERESHOLDS
Your Thor engine, according to the pilot weight and wing size, must
have a flight temperature between 200° and 230° under sparkplug
(these measures have been taken with Polini thermocouple tool –
928.830.002). This parameter may vary according to different
factors: environment temperature, working height, wet, and quality
of the fuel used, anyway this temperature has not to exceed
250°-260°. Furthermore it is important to say that carbon deposits
caused by a richer mixture may limit during the time the exceeding