I ride a 1986 vn750, which I have done a complete restoration,everything is stock except the exaust,used stock headers, built straight system,pipe on each side. I have been having a problem lately when running around 3000rpm,seems to have a flat spot,open the throttle a little and she runs great.
I have had the carbs.off and even taken them to the local dealer and service dept. was supposed to have gone through them and,says they are perfect. I know the carbs.need to be syncronized,but would this cause this problem? need any and all info.