my engine os .40la and its 10years old and it run very good but sometimes it spuders it runs good so you can fly but once in the air and one or two min,s it spuders

Take the needle valve out and pump fuel through the carb ( just a little ) clean the needle off and put it back in. Turn it all the way in ( DON"T jam it ) then turn it out 1 1/2 turns and start it up. Once started adjust it. You will probably have to lean it from that point. I adjust mine at 1/2 throttle till I get Max RPM then I richen it about 2 or 3 clicks and check the throttle response and adjust more if needed.
If you still have problems you may want to flush your whole system and check all your tubing. Chances are the above will help.
ENJOY !!! RED

sputter

thanks for the tip and for the prop spelling sputter the engine is running good now thanks agian red head