Hello,
I have a 76 CB400 F that has is running very poor, nearly as poor as my bike mechanics knowledge. The main problem could be described as power loss- the bike would struggle to rev from 2/3,000rpm, stall and then either return to 'normal', or more often than not, cut out altogether. This would often be accompanied by a missfire. As the problem seemed to develop after about five or ten minutes of riding I originally thought it was an ignition fault- the coils overheating and failing or something. The sparks, plug leads, and coils seemed fine. The bike had been changed to a Boyer Brandson Mark 3 Electronic Ignition and but I don't really know how to check if it is functioning correctly. I checked the timing and it seems to be okay( although it's quite difficult to get the bike to hold a steady 2,500rpm). So my next step was to have a look at the fuel system. When i stuck a flash light into the tank I could see alot of rust. So my question is could this be the problem, and should I try sort out the tank before even looking at the carbs?
Cheers,
Mannix
