Ok, It's a .40 size Tower motor on an avistar. Suppoesd to be new when I got it. On a plane but never flown the plane had so many problems that I'm sure it had not flown much if any at all.
So much for background now the problem. It has had about 5 tanks of fuel run throught it and it still won't idle. it runs up on the high side real good. The carb has a little hole in the front that is for low speed air and a screw on the side that screws in and out to lean or fatten the idle mixture. NOW...... the thing will not idel without a glow stick unless the screw is turned out some 7 to 8 turns??? at 7 turns out is where the hole in front is completely open, thus no adjustment, it simply wont run unless the hole is totaly open.
Yes many glow plugs have been tried. With and without idle bar. better with idle bar but still won't run.
carb has been removed and cleaned, checked the O ring. seemed a little flat for an O ring but it seals fine.
Fuel Tank seems to be set up properly and new feed line installed.
And FAT!!!! Man does it like to be FAT. Fuel all over the place.
It seemd to be loading up at idle, when comming of full throttle it will run smooth for mear seconds and then load up and die.
The low end screw can be turned out untill the spring unloads and when the throttle is pushed to full the screw turns it self in till the spring loads and the screw stops but no difference what so ever.

Is it time to replace this thing?
It's new but second hand, does anyone know if tower has a workmanship warranty on their motors?

Thanks, Miloh.