i HAVE A A .46fx....I have read the instructions 100 times but cant find or distinguish between the needle valve and the Mixture control Screw. They talk about it in different sections of the manual.

I know which one the neddle vavle is...the long on behind the motor...I also understand that I start to tune/close from 1.5 turns from closed....

Where is the Low end neddle...how do i adjust it?????? and how many turns from closed do i start from.

Thanks.

I already broke the motor in, but i stall for a split second when i go from idle to full throtle...I am pretty sure that that means that it is to rich, but I already am a 1 turn on the high speed...it seems ok...

Please help me tune the low end...where is it?!?!?!

There is a small screw in the throttle barrel. On the side of the carb that has the arm that opens and closes the throttle barrel, there is a small srcew in the centre of the pivot point of the throttle control arm. That's your idle mixture screw... you'll need a fairly small screwdriver to get in there... adjust it an eighth of a turn at a time at most. Don't try it with the motor running... it's way too close to the prop!

Mauricez4, don`t worry man, you are almost done. The mixture control screw is on the carburator right side ( muffler side ). Look your carb from that side and you`ll see a hole in the center, next to where you attach the throttle linkage. Inside that hole you`ll see a small screw head, thats the mixture control and is only for adjusting the idle speeds mixture. Run your engine and warm it up at half throttle, then shut it off and adjust/close that tiny screw 1/16 of a turn clockwise, start the engine again and you`ll start seeing the difference in acceleration. You will repeat that 1/16 tweak various times until your .46 accelerates smoothly.
The high speed needle is the big/long one, and you adjust that one at full throttle. Run the engine at full throttle, start opening the needle ( counterclockwise )slowly until the engine starts loosing RPM`s, you are richening the high speed mixture then, then start closing it until the engine reaches max RPM`s, then open the needle again a little bit so you loose a bit of RPM and leave it there. You are set.
You will have to repeat this adjustments later as your engine gets broken in further, just repeat the above. If you have any questions feel free to contact me anytime.