Lawdawg131 the Tower Hobbies .46 is a GREAT little engine.

Some tips.

Loosen the carb retaining screw, turn the carb itself to loosen it and press the carb against the engine TIGHTLY while retightening the retaining screw. This helps to eliminate any air leaks.

After you have run the engine for a bit ( which you have ) tighten down ALL of the cap screws. Also tighten down the fittings and remote needle valve. As they come they tend to leak air after the engine has been run. Don't overdo it though!

Retune the engine with about 1/2 a tank of fuel in the plane.

Set it for optimum RPM's at high throttle and back off about 3 clicks.

Set the idle needle for optimum RPM ( you'll notice a change in sound ) and again back off about 1/8-1/4 turn.

Let the engine run for a while. Does it slow down at idle and die after 2-3 minutes or more? If so it's too rich on the low end.

Point the plane nose up. Is the idle still OK albeit a bit faster?
Run the engine up with the plane nose up. Is the high throttle OK albeit a bit faster?

Point the plane nose down about 45 degrees or so. The engine will slow down but it should NOT shut off.
Do the same check at idle. Make sure that the engine does NOT shut off when the plane idles nose down.


You are trying to hit the "window" where the engine will not shut off in any attitude. Usually once you find this, the transtions will also tend to be OK.


If you find that nothing you do seems to get you to this point, look to problems with your fuel system.


Also the T.H. engines don't settle in until you've run about a gallon of fuel through them.