Et -U P; Motor Fine Tuning - Reely BIG PYRO Bedienungsanleitung

6 s
c
luTch
- At idle speed the clutch doesn't yet grip, the model remains stationary with engine running.
- When the revolutions are slowly increased the clutch "slips", the vehicle moves forward or starts to move slowly.
As with a "real" vehicle, constant slipping of the clutch can cause the clutch to "smoke away" or "burn off".
- Only at high engine revs does the clutch start to "engage", the engine speed is transmitted without any slip to the
drive section. The wear on the clutch linings is now at its lowest.
- Frequent, strong load changes by brief short throttle bursts and jerky lowering of the revs also reduce the life of the
clutch linings. With short throttle bursts as well as by letting the clutch slip, you achieve a slow speed, but at the
expense of the clutch.
B
eaRInG
Overheating the engine and/or the clutch also has an effect on the bearings of the clutch bell.
Leaking and toughening of the bearing grease (running dry of bearing) as well as different expansion of the balls and
the ball bearing case in the case of excessive heat, can lead to a jamming of the balls. If the balls can no longer move
freely, there are frictional losses and therewith an additional heating up of the engine shaft.
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6.1
e
nGIne fIne TunInG
After the run-in phase of the engine, you can start the fine tuning to increase the performance.
To that effect, optimize the mix preparation for idle speed and change-over at the idle speed mix adjusting screw and
with full throttle at the main nozzle needle.
a
djusT The maIn nOzzle needle
- Start the engine and remove the plug connector. Let the engine warm up for approximately 1 min.
- Drive the model as usual. If it seems that the engine runs too rich, make the mix leaner by screwing in the main
nozzle needle by 1/16 rotations respectively, until the desired setting is reached.
- Make sure that the mix is not too lean.
A light white trail of smoke should always be visible coming out of the exhaust pipe.
a
djusTInG The Idle sPeed mIx adjusTInG scRew
- Start the engine and adjust the main nozzle needle, as described above.
- Reduce the speed until the centrifugal clutch does not engage any more and that the wheels do not turn any more
when you lift the model off the ground.
- Let the engine cool down in idle speed for approximately 10 – 15 seconds.
- While you are holding the model with your hand, drive at full throttle once briefly and strongly.
Make sure not to touch moving parts!
- If the engine stalls as soon as you run at full throttle, then the idle speed mix is too lean.
- Enrich the mix by unscrewing the screw by 1/16 rotations while the engine is switched off.
- Restart the engine and repeat the procedure until the speed transition from idle speed to full throttle is effected
softly and spontaneously. A small delay in response is normal.
- If the engine smokes strongly during transition from idle speed to full throttle and sounds very rough,
then the mix is too rich.
- Make the mix leaner by screwing in the screw by 1/16 rotations while the engine is switched off.
- Restart the engine and repeat the procedure until the speed transition from idle speed to full throttle is effected
softly and spontaneously. A small delay in response is normal.
- Drive the engine as usual in order to get a feeling of how the engine reacts to load changes.
- Modify the setting until the performance characteristics correspond to your expectations.
Avoid moving the carburettor frequently once the optimal setting has been found.
The threads of the nozzle needles in the carburettor housing deflect if they are moved too often!
Once you have carried out these settings, a readjustment of the throttle stop is however necessary.
a
djusTInG The Idle sPeed adjusTInG scRew
The idle speed adjusting screw regulates the idle speed via the position of the slide carburetor (choke limit stop).
The bigger the carburetor outlet, the higher the speed. Turn the screw clockwise in order to make the mix "leaner" (to reduce
the proportion of fuel) and anticlockwise, if the mix should be "richer".
Depending on fuel, glow plug used and environmental conditions, small modifications in the settings might be necessary.
48
-u
eT P
-u
eT P
(
full throttle mix
)
Turn the screw clockwise in order to make the mix "leaner" (to reduce
Operating instructions WD GP Buggy Chassis „Big Pyro" RTR No. 3 35 0