I have a vstar 650 2006 ,12k miles. Towards end of summer last year was running great , was on a cruise at 60 mph and all of sudden lost power. Could barely get it home . It will start up and idle , as long as chokes on. I try to rev and it sputters and stalls. So i went thru replaced spark plugs (which were black ) fuel pump , fuel filter ,took carbs apart and cleaned ,replaced with stock jets (im only owner and bike was never modified ) still same problem. Tested coil was in the normal range , tested compression but only had a tester with rubber end u hold in spark plug hole ,both cylinders are 125+. Im kinda at a loss at would it could still be ,any ideas?