Hello, Went for a ride today and bike worked good until i went to a highway and rode about 60mph at and bike started to spit back to carb and also popping in exhaust. I pulled over and changed spark plugs but i didnt help, i could still ride it but soon it got worse. Got it home and started it up again, it idles okay but soon as i try to rev it it just bangs and pops in exhaust and spits huge flames, wont take high rpm at all. It feels that its running retarded. Its fitted with K2F magneto and AAU. I took of the timing cover and the bob weights are sticky, i mean that i pull them full advance position and they stay there, theres one point where chain is slightly slacker and AAU works as it should. Lets keep in mind that i dont have timing tool or cut open cover so dont know if its because of no support at the center axle. I also checked with strobo light that both cylinders give spark continually even though its spitting flames. So i would guess that either the AAU wont advance at all, or then timing is not correct anymore. What do you think? Could the AAU stick in retarded position? I've read that it would stick advanced position but would the symptoms be that kind if it was fully advanced all the time?