CBX 250: Poor performance at high speed
My Honda CBX250 Twister which has only done 1500 miles has developed quite a bad surge in power, runs quite erratically at anything over 7000rpm and it is almost impossible to get it to exceed 70 mph. It feels almost as though it experiences fuel starvation and I have checked the fuel flow to the carb, without any success. I would like to try and fix it myself, but have avoided taking the carb off and opening it to for instance, interfere with the float level setting. The idle mixture screw is all but inaccessible, but adjusting it would only affect the idling setting, not so? I'm assuming that it is a fuel problem and it is out of it's warranty, being a 2006 model. Can anyone please assist with advice as I would like to tackle and attempt to solve the problem myself before taking it to a professional workshop.