Once I got it the thing rode like a turd literally no faster then 55 mph. So I change the plugs,oil,and battery I also noticed the mufflers arent stock, the carbs were clean. And the smoke only seems to occur when I accelerate and the bike has a problem dropping rpms. It stays up for way to long and starts to mis fire and pop when I slow down. O once I changed all that stuff and did my points the bike flys now. Hit a good 60 in 3rd gear. O and if I twist the throttle forward pretty hard the rpms drop some. Sticky cables?