Originally Posted by
Beddo
Sounds like you may have screwed the LS needle in too far and shoved the throttle slide out, meaning that the throttle is part open all the time. Wind the LSN out again and see if it helps?
This gets my vote. My Kyosho motor was like this; the LSN is in the carb slide, and if you screw it in too far it starts pushing the slide open, just like you're turning up the idle. If your carb is like this too, then note that "all the way in" doesn't mean screw it in until it won't screw farther; it actually means screw it in until the carb slide starts to move. Remove the air filter and you can see when this happens.