Now, that you have broken-in your motor ( you did break your motor in didn’t you?) your ready to proceed. If you
try to run your motor the way described next without a proper break-in. you will at the very least take years away from your
motors life. At worst you will make yourself a very expensive paper weight. Go to Motor Break-in if you Havn't broken it in.
High Speed Needle Adjustments. Setting up or resetting the high speed needle (or
needle valve as some call it) can be easy. If you follow the directions closely you should have no problem. If you follow
the following directions and it never seems to set right. Go to the trouble shooting section, or ask an experienced modeler
for help!!! Something maybe wrong.
Fill your fuel tank.
Prime your motor.
Apply power to your glow plug.
Using an electric starter or chicken stick start your motor.
Clear The Motor. Once your motor has started you may need to leave the glow plug
driver on till you cycle the throttle from idle to full throttle a few times. This should clear the motor of extra fuel from
priming if need be. Then remove the glow plug power. If the motor dies, lean the high speed needle a little. ¼ to ½ turn should
be good and try again. Repeat till motor will advance to high throttle and remain running when power to glow plug is removed.
Choose Your Method. Now there is several ways to do this next step. One is with
a tachometer, another is pinch and release method, and the other is with sound (by ear) If you have access to a tachometer
and you have little experience, then use it. If not DO the pinch and release method. If you have experience with motors (like
R/C cars) you might be able to do it by ear, if not, that will come over time.
Tachometer Method. Using a tachometer (follow tachometers instructions) take a reading
of the props RPMs. Now using the high speed needle, lean the motor slowly. You will see the RPMs increase. At a certain point
the rpms will not go higher and will even start decreasing. Stop and turn the needle the opposite direction. (richer) several
hundred RPMs. For example if the highest RPMs were reached at 16,500, you would want to richen the needle till the RPMs read
16,100. Now one final test. Hold your plane with the motor pointing straight up. If the RPMs increases slightly but the motor
doesn’t sage. That should be it, your motors set. Enjoy!!! If it does sage, then richen it a few clicks. When you hold
your plane motor up, you want to hear a slight increases in rpms without a sage. That is when you know your motor is dialed
in.
Pinch and Release Method. Start your motor and advance to high throttle. Now pinch the
fuel line by the carburetor and release it quickly. If the motor speeds up slightly and then resumes it’s previous speed.
Lean the motor a few clicks and repeat. At a certain point the motor will not speed up when the line is pinched. When this
happens, richen it a few clicks. Now test the motor by holding your plane with the motor pointing straight up. If the RPMs
of the motor increases but your motor doesn’t sage, congratulations. Your motors set!!!! If it does sage, then richen
it a few clicks. When you hold your plane motor up, you want to hear a slight increases in rpms without a sage. That is when
you know your motor is dialed in.
Ear Method. If your using the ear method you should be familiar with R/C motors. Start
your motor from a rich setting. Start leaning the high speed needle. You should hear a constant increase in rpms. When the
rpms stop increasing or even start to fall a little, STOP! And richen the needle several clicks till you hear the rpms decrease
a few hundred rpms. Now one final test. Hold your plane with the motor pointing straight up. If the RPMs increases slightly
but the motor doesn’t sage. That should be it. If it does sage, then richen it a few clicks. When you hold your plane
motor up, you want to hear a slight increases in rpms without a sage. That is when you know your motor is dialed in.
Next we'll discuss the low speed needle and how to set it.
