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Robbie speaking for expert village. We spend a little bit of time talking about tuning.
Another very important aspect of it these motors are two stroke engines, ok, and all
that really means is that they get about 25% of their cooling from the air, that's what
these heat sinks heads are for. So as air passes over the motor it helps to cool it.
The other 75 up to 80% of the cooling comes from the oil that is premixed in the fuel.
So all you really have to do is maintain the right percentage of fuel. The fuel has the
oil in it and air. In a nutshell, you're looking for a perfect balance of the right tuning
on the motor. If you have too much oil, we call that fat. The motor is going to run really
rich, it's going to sound like a diesel truck and you're not going to get any performance
out of it what so ever. It will spit, it is blubbery, it will have excessive smoke, everything
coming out of it, you won't get up to your full performance. If you run it to lean or
not enough fuel with the oil in it going through the motor what that will do is it will generate
way to much heat. These motors are sand cast and they really don't want to run a whole
lot more then 300 to say 325 degrees. So if the leaner it is the more performance your
going to get out of it, but you will burn it up. There won't be enough oil to lubricate
the parts; you will be down at your hobby shop buying a new motor in no time at all.
So the trick to it is, is finding the proper balance between lean ok and rich. How you
do that, is with the needles that are on it. There's a main needle, high speed needle,
which is this one, bit of a miss nomer, it's just your main needle. By turning the needle
in makes it leaner turning it out makes it richer. So if the motors hot your going to
want to just turn it counter-clockwise or turn it out that gives it more oil through
the motor. There is also a low speed needle you'll find those typically on the end of
the carburetor or the barrel as its also known, and that's the screw right here that adjusts
the air fuel mixture. It's kind of a fine tuning adjustment and that adjusted for an
idle and off idle so it's more of a fine tune to get your engine just precise. Once you've
set your high speed needle down then you'll fine tune it with that with the low speed
needle and then the final adjustment that you'll make on is just to set the idle. If
the idles to low, of course, its going to stall out every time you let off on the trigger.
If it's too high it's going to cause the engine to race unnecessarily. Well that's your basics
of engine tuning.