the last time i fired up my TT .46 Pro, it was very sluggish to accelerate. i know its just a tuning issue but i'm not sure which knob to turn and which way. any general or specific suggestions on tuning my motor?

Thanks!
John

Sounds like it's loading up on the low end. On the side of the carb, in the center of the throttle lever, there is a tiny screw adjustment, turn it clockwise 1/8 turn and try it again.

Do this until it runs right (Note, you may have to tweak -to the rich side - the high end after a few low end adjustments)

Thanks, i'll give it a try.

Suggestion for you. Before doing any tuning, try a tank of FRESH FUEL. Either from an unopened jug you have or from one of the people at the field. You may just have some bad fuel.

Also, if I'm not mistaken, Thunder Tiger Pro .46's like OS #8 glow plugs. I would check to make sure the fuel was good and put in a new #8 glow plug and then give 'er a whirl!

Dave...

the glow plugs i'm using are #8 and have only 10 flights on them so i dont think thats it. i really feel it has to do with the motor running either too rich or too lean, of course im' not sure how to tell which it is. i'll just have to fiddle with it for a while i guess.

Aluminum sloughing off during breakin can foul a glow plug and cause sloppy running. TT PRO engines should be broken in on a bench at WOT while underpropped at a rich scream until the exhaust residue runs clear and the needle holds steady. An 8x6 is a good breakin prop.

All my engines run perfect with no deadsticks for years. PM me if you want to learn how.

You need to get your engine to a base tuning. We do this for our RC cars. For the TT46Pro, the high speed needle is usually opened about 2-2.5 turns from fully closed, the low speed needle I am not too sure now but its about 3 turns out max when the throttle is fully closed. If your engine picks up sluggishly then its usually (assuming your prop is the correct one) your low end is too rich. You need to close it about 1/4 turn at a time till it picks up smoothly. Once its smooth then you can perhaps open it just a touch maybe 1/8 turn only. This ensures your engine will not overheat a bit.

From experience I have noticed that if you have gotten the high speed needle right and the engine seems to be really hot then open up the low end.

My TT46 starts with a backflip of the spinner.

Use a 10x6 prop for starters. Set the high end by starting with the high speed needle valve open about 3 turns. Open the throttle (have your plane well secured and be behind it). Turn the needle valve in (to the right) slowly as long as the engine keeps speeding up. This is usually at around two or two and a half turns. Then open it about an eight turn, so that it slows down just a little bit.

Then while the engine is idling, pinch the fuel tubing to the carb. If the engine speeds up before it quits, the low end is rich. Turn that little screw (with engine not running) in the hole opposite the needle valve one eight of a turn to the right. Restart, and try it again. When the engine quits speeding up when the fuel line is pinched, open the low end screw just a tweak.

If you have to make a big adjustment to the low end, you should re-adjust the top end. If that needed much adjustment, then you should redo the low end again. That should get you pretty close to dialed in.

I run an OS A3 on my TT Pro 46, and it loves it. As for adjusting the High End Needle, I always readjust it after making any adjustment on the low end needle. Its quick and easy, so theres no reason not to. And never adjust the low end needle more than 1/8 turn at a time. I use the throttle transition from low to high, rather than the pinch test.

Brad