Ok, just bought a maxx used, and it was locked in 1st gear when I got it (the person I bought it from tightened the screw down all the way). I backed it out and it was shifting quite nicely. Well after about the 8th tank, it just stopped shifting. I pulled it in, checked the screw tension and it seemed ok. Ran again, still wouldn't shift. I took the tranny apart and everything looked ok. Any suggestions? How many turns out from bottom do you guys have your 2-speed set to? Thanks in advance.