Hey everyone, I have a CG falcon III and it has a magnum either 32 or 36 and tonight was the first time i've started it and it started really easy, but when it starts it goes full throttle even when the throttle is all the way down then Ihave to prime it again and it will do the same thing. What am Idoing wrong, im new to the nitros.

Take it one step at a time:

Check the fuel tank and fuel lines - look for leaks, loose connections, any problems with the clunk, and make sure the tank is mounted right: not too high or low. Try using a syringe or pump to pressurise the tank with a little fuel in there; slosh it around, and if there are leaks, you'll get bubbles.

Recheck your needle valve settings - high and low. On Magnum engines, the idle needle is often a brass screw in the center of the carburetor barrel (the throttle arm side of the carb). Get the manual, or try to download it to see what the initial settings are. Open the needles to the initial settings. If you don't have the manual/can't get it, here are some guesstimates. A good guess for the idle setting is to screw it out until the head is flush/even with the throttle arm. Try starting it, and for most such carbs, you end up adjusting in from there. A high speed needle guesstimate is two and a half turns open. These settings have worked for me when I've had to start secondhand engines but I end up having to dial them in from there.

Make sure you have pressure from your muffler - check the line going from the muffler nipple to the tank.

Check your servo travel - is it reversed? Does wide open throttle mean wide open throttle, and closed throttle mean closed throttle? Use your transmitter's servo reverser switch if needed to set it right.

Check your carb for loose bolts, air leaks around the crankcase, faulty or missing O ring at carb/crankcase, leaks on the fuel inlet nipple. Use thread locker to keep barrel retaining screw from backing out.

Good luck. I've run Magnum engines, and they are great bang for the buck. Nitros are actually a lot of fun, but tuning them can be black magic.

Really can't go to full throttle if throttle is closed. That 's the key. Is throttle barrel fully closed.It appears something not operating correctly.Make sure all linkages are operating..

Welcome to the RCU forums, Sandman.

That propeller is dangerous, more when you are not familiar with little engines.

Is it possible to find experienced local help for your first steps?

Stay behind the arc of the propeller and avoid starting at full rpms.

Always retain the plane with something more than your hands.

Try reversing that channel in your transmitter first.

Read this:

http://www.gettingairborne.com/engines.html

Best luck!

Sounds to me like the screw(bolt) that secures the throttle arm to the throttle barrel is not tight.

I havent owned many OS engines...but some of them I have owned have a plastic arm that just bolts to the barrel.  If the screw that secures this gets loose, you have no control over the position of the actual throttle.  The arm will move...but the barrel will not.

Thanks for all the advice, I went and got a new tank and all new lines, and I found a manual for the engine, so that will help. As for the throttle not closing all the way that was a setting on my transmitter. I have a Futaba skysport 6 with the Throttle ATV and the low setting was turned all the way down and that was not letting the throttle close.

by "all the way down" do you mean the throttle stick on the transmitter? If so, does it actually move the throttle arm on the engine? In other words, is the throttle actually opening and closing?

The throttle atv was all the way down which did not let the carb close all the way, now that Iturned the atv up it lets the carb close when i pull the throttle stick down on the transmitter

Somehow I didn't see the previous post. Oh well, better late than never, huh? I'm glad you got it figured out.