Bought a xr6 off a fellow tt member. Need help w/a bog problem. Have not had very long and have not played w/it yet so not sure of the jetting but.. after a long w/open run and (now I find) after a section of whoops it SOMETIMES bogs and only will take 1/4 throttle. I baby it for a min. or two and it will take full throttle again. Seems to happen more just after I get on the gas hard. Runs great otherwise. Has a p.c. pipe on it. Just bought a stocker to be legal. Lean jetting? Foat? Any ideas?