STARTING ENGINE
Engine Maintenance
Always check the engine mounting bolts muffler glow plug propeller
and spinnner etc before attempting to start the engine Check for
loose bolts nuts or screws which may come off when the engine is
running and cause serious damage Always check the area in which
you will be flying or just running the engine Check for possible hazards,
such as loose rags rocks, tools, etc . lying on the ground which may get
caught in the prop
If you intend on starting the engine by hand flipping the prop always
use a chicken stick and be sure to check the position of the prop It is
most comfortable when it is at the 2 o clock position when starting the
compression stroke When you are using an electric 12V starter, the
position of the prop is of no concern
Engine Break-In and Starting
Most manufacturers recommend that the engine be broken in on a test
stand We also recommend that this be done according to manufacturer s
instructions If a test stand is unavailable the engine may be broken-in
ontheAvistar Breaking in the engine allows the parts to seat to each
other
1 Remove the carburator fuel line and the muffler pressure line
from the muffler
2 Fill the fuel tank through the carburator fuel line, when the tank
is full the fuel will come out the pressure line
3 Reconnect the tubing
4 Follow your manufacturer's instructions according to needle
valve settings
ENGINE TROUBLESHOOTING GUIDE
SYMPTOM
The engine does not start
The propeller is difficult
to rotate
The engine fires but does
not start
The engine starts but does
not sound or run good
POSSIBLE CAUSE
Glow plug battery is making
poor contact.
Battery is dead or has a very low
voltage
Bad glow plug (burned up or
or deteriorated filament)
Improper air/fuel mixture
intake
Engine is flooded with fuel
Engine may be flooded.
Fuel is not reaching the carburetor.
Improper break-in procedures
Loose plug or bad plug
5 Turn the radio on and open the throttle to full open Place your
finger over the air intake on the carburetor while turning the
prop counter clockwise a few times Notice the fuel line If any
fuel is being sucked into the carburetor turn the prop a few
more times If no fuel is reaching the carburetor recheck the
fuel line plumbing
6 Reduce the throttle to 1/4 or 1 2 throttle for starting
7 Using a starting stick (chicken stick) and holding the fuselage
firmly quickly flip the prop in the counter clockwise direction
Do not attach the glow plug clip in this step This will prevent
the engine from being flooded and will make starting much
easier Do not use bare hands/fingers for starting as the kick
back from a model engine can be strong enough to cause
severe injury
8 Attach the glow plug clip at this time.
9 With quick flipping movements flip the prop in the counter-
clockwise direction If the engine does not try to start in the first
few tries double check your procedure and keep trying
10 Once the engine has started listen carefully to the sound of the
engine The sound of the engine will tell you how the engine is
running if you know what to listen for A lower tone popping
sound is the sound of a rich running engine As you turn the
needle valve in the popping sounds should decrease and the
ptch of the engine should rise The optimum needle valve
setting will depend on your engine Again check with the
manufacturers recommendations for engine break in proce
dures and valve settings
11 If you continue to have problems with the performance or
starting of your engine, refer to the engine trouble shooting
guide shown below
SOLUTION
Check to see if the battery is wired correctly and
to see if the clip is making good contact with the
plug
Replace or recharge the battery and check to
make sure the battery can glow the plug red hot
prior to starting
Replace the glow plug
Prime the engine through the carburetor air
Close the needle valve completely and try to
start the engine It should start and then quickly
stop Reset the needle valve and continue
starting
Remove the glow plugs and rotate the engine
until only a mist of fuel remains in the cylinder
Replace the plug and continue
Check the level of fuel in the tank Recheck fuel
Open the needle valve a half turn or so and
continue
Check the break-in procedure and repeat
Replace the plug and/or tighten the old plug
17
Summary of Contents for avistar 40
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