I can't seem to figure out what the problem is with my 1980 CX500. Just a few days ago it started acting up. It runs and idle's fine but if you get from 5-5000 rpm's it starts to sputter and it won't accelerate. I have to be real easy on the throttle so it doesn't do this. I took it to a Honda dealer and they said it could be carbs or possibly the cam chain. Has anyone ever had this problem? How do you fix it?