My motorcycle (100 inches RevTech engine, Mikuni carb HSR42) broke down. It drove 1100 km with no problems. And then after one night motorcycle did not want start. I used the choke but I needed also increase revs beacuse it did not want to run. Since then the bike runs bad, I can not adjust revs, I have to set it high than proper because if it is correct than engine stops. I think that it can be carb. I found that screws that hold intake manifold to heads were loose. Between intake flange mountings were abuot 0,5-1 mm of space. I inserted allen wrench and I could screw the bolts with just one finger. I tightened it but the bike is still running bad. What to do??