You say "lots of missing" but you don't give any details. Is it all the time and throughout the entire rpm range? Or is it just at idle? Does it change as the engine warms up? What about at wide open throttle?
The missing is most noticeable at idle and low speed cruising. Enough to make the bike feel like the the final drive is bouncing at the soft coupling. At highway speeds it is very faint. It is not as severe as if you just pulled a wire and it was no spark missing. More like missing because of vacuum, intake boot, insulator, or dirty filter.
At idle it would no be: brrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr
More like: brrrrrbabrrrrrrrrrrrbababrrrrrrrrrrbrrrrrrbabrrrrrrrrrrrrrbrrrrrrrrrrrbrrrrrrrrrbabrrrrrrrrrrrrr
