Vibration and running issues with bike???
So I just had my engine torn apart and put back together and now I have some issues I cant figure out. (rebuild was for a broken shift linkage) I reinstalled the engine, added cobra exhaust, pod filters on carbs, rejetted, and coastered the bike. It took some work but I can start the bike and it will idle about 1200 rpm fairly well. Been working and riding on and off for a week now. It drives fine and shifts through the gears with no issues. My issue is that it vibrates like crazy. On a 20 minute ride my butt, hands, and feet were all falling asleep. This is at all speeds and even at idle. One of my carbs has a tendency to backfire through the air filter/carb occasionally after warming up as well. Im not sure if the 2 problems are related or not.
I have checked all mount bolts, intake leaks, removed carbs and checked, etc. Im not sure what I am missing or whats causing the issues. I tried checking my carb sync and it seemed like it was pretty even. Does any one have any ideas what might be causing these problems?