HAVE NOTICED THAT I HAVE A STUMBLE ABOUR 2500-3500 . FEELS LIKE IF IT WAS A CARBED BIKE IT WAS JETTED TO RICH.LIKE ITS LOADING UP. CLEARS OUT AT 3500RPM AFTER THAT ITS FINE. DIDNT SEEM TO NOTICE IT TILL AFTER I PUT ON MY YOSH BOLT ONS. DIDNT THINK THAT THEY SHOULD CHANGE ANYTHING ? ANY IDEAS? WOULD A TRE HELP ? FROM WHAT I READ THEY GET RID OF THE TIMING RETARD. WHICH IT SORT OF FEELS LIKE, IF I CAN REMEMBER BACK TO MY CARBED MUSTANG DAYS. OR DO I BITE THE BULLET AND GET A POWER COMMANDER? ANY HELP WOULD BE GREAT THANKS GUYS