i started an overhaul on my gp1200r about 2 months ago had to rebuild the carbs and replaced all fuel lines and installed a primer kit! not to mention had to fix an issue with my #2 power valve that dropped!!!! i got it all in today and drained a battery trying to start it and realized i left the primary line disconnected lol fixed that and it starts up i ran it for about 30 seconds ran a lil ruff i gave it a little throttle to see if it would clear up it bogged slightly and backfired!! now my first guess is that there is still alot of air in the system that i need to let run out!! just wanna get some ideas before i pull it out of the garage and run it longer...

thanks always for the great help and special thanks to rich at wfo for the powervalve parts