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Old 08-04-2004, 11:23 AM   #11
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Just one more thought, I had an almost-similar problem. Engine worked fine until one day quit in flight - 2 times in a row .
Thought it was dirt in carb, so next night took carb all apart & cleaned (didn't find any problem, but who knows). Added fuel filter .
Now it wouldn't run at all. Just start for 1/2 second, then quit. No matter what I did with needle valve, just not getting enough fuel.
I finally had the thought "no tank pressure" - poked a wire through the pressure tap into the muffler, and bingo, fired right up and works great again.
Don't know what blocked it, surely not the first thing you would look for!
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Old 08-07-2004, 06:53 PM   #12
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I am: Dylan S
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i am having troubles with my tt 46 as well. my idle screw is only about 1/8 turn open. i know that can't be right but the low end works fine (5 seconds to kill it with pinch test, no hesitation from idle to full) My high needle is 3 1/2 out. When i run it up on the ground, it takes about 10 seconds of WOT to get over 300 degrees. Power drops off and returning to idle kills the engine. This motor has just been rebuilt with new bearings, totally cleaned and sealed up with high temp silicone. The o-ring on the needle valve has been replaced as well.
This motor is not performing to what i had expected. Its on a 4 1/2 pound omp edge profile with a apc 11.5X4 and climb out from a hover is pathetic.
I have had a couple lean runs with it before. is it junk now?
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Old 08-07-2004, 08:19 PM   #13
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I am: Bob D.
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Might I recommend a 12.25 x 3.75 prop (bit more than what you have now) This is the prop I use on my fun flies with a .46FX. These planes are not meant to work continuous at full throttle as the revs are high. Also, check for any holes in your fuel line that might be leaning out the mixture.

Blowing out the needle valve assembly (remove needle and pump fuel through) would take any garbage out that might be there.

Never give up on an engine

Bob D.
Ajax RC Club
Indoor Aero-Choppers
Member of MAAC since I joined

Lighten Up, Life is waaaaaayyyy too short
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Old 08-08-2004, 12:56 AM   #14
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i ran a 12.25X 3.75 last year but don't anymore because it slowed the throttle response. it might be worth it to try it again since i didn't have these problems last year.
Could having the engine mounted on its side have anything to do with it leaning out? This engine was first mounted on a magic extra. ran perfect. next it was a phoenix sukhoi 46. it was mounted on its side and i had overheating issues even with the cowl off. after that it was on a twist 3d, again no problems whatsoever. now, its side mounted again on a profile and the problem is back.
There's no junk in the carb as this happened on its first flights after a complete tear down. I'll reseal everything and check the fuel lines though.
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Old 08-11-2004, 09:33 PM   #15
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Problem solved. I had a leaky needle valve, even with a brand new o ring on. i wrapped some teflon thread tape around the needle valve and my engine runs great. I was able to lean it about 3/4 turn and could go a bit more too. 12 flights since i fixed it and no deadsticks and no more overheating. My low needle is still 1/8 open but the bottom end is rich so i won't worry about it.
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