Recently bought a 2006 Polaris outlaw 500 that sat with old gas for awhile. It would idle fine but bog down and stall in gear. So, I drained the and cleaned the tank, all fuel lines, cleaned and rebuilt the carb and put a new fuel pump on it. Starts right up and idles fine, 1st gear is fine. in 2nd gear, once past 1/4 throttle, it bogs down and dies. Any ideas on what it could be? Thanks!