I have a Bazzaz fuel controller, MNNTHBX MTake and a Brock's Alien head exhaust. My Z125 will only hit 64 mph, and that's downhill with a tail wind. Stock Z125s do this. With the mods, the bike should pull to redline easily in 4th gear (stock gearing). I have tried different Bazzaz maps and no change is noticed. Now I am lead to believe that there is a restriction somewhere. The bike has been on a Dyno and get 10.12 hp. The bike pulls hard up to 50 mph then peters out. I am thinking maybe the filter internals are collapsing at high RPM. Any ideas or thoughts?