Hi Ive just completed my project cafe 1978 CB 550 which has taken me best part of a year, and today was the first time in 4 years the bike has been out for a run, approx 20 miles round trip for its MOT.(which it passed no problem)
but i think my rev counter is faulty or very slow to react, has any one come across this problem before, while sitting at 30 mph in 4th my rev counter is at 1800 rpm at 60mph in 5 its at 2000 rpm, if the bike is standing still and i rev it the rev counter will not go above 3700 rpm?? ive checked the exhausts and all 4 are hot but im not sure if im only running on 3 sometimes 4 cylinders, would this have that effect on the rev counter? the carbs are balanced and the timing is correct, i think!

heads done in!!