polaris sports man atv help?

[big girl]

OK I HAVE A 2002 POLARIS SPORTSMAN 500 HO A FEW DAYS AGO I WENT TO THE BEATCH AND IT RAN FINE EXCEPT THAT THE VOLTAGE REGULATOR WENT OUT IT STEEL RAN BUT IT RAN OFF THE BATTERY THAT'S ALL AND WHEN I WENT TO LODE IT IT FELL BECAUSE THE RAMP SLIPPED OK I WASHED IT WHEN I GOT HOME AND PUT IT UP ABOUT A WEEK LATER I GOT A NEW VOLTAGE REGULATOR PUT IT ON AND IT STARTED UP JUST FINE AND I COULD REV IT IN NEUTRAL AND IT WOULD REV ALL THE WAY UP BUT WHEN I PUT IT IN GEAR FORWARD OR BACK IT WILL NOT GO PAST LIKE 1500 RPM AND IT HAS NO POWER AND IT POPS AND CRAP IF YOU REV IT ITS LIKE THE REVERS SAFETY THAT STOPS YOU FROM GOING FAST IN REVERSE IS ON WHEN YOU GO FORWARD OR IN REVERSE AND THE OVERRIDE WILL NOT WORK AND IT WILL GET HOT AND THE FAN WILL NOT COME ON THE MOTER IS GOOD IT JUST WILL NOT COME ON AND I CANT FIGURE IT OUT AND POLARIS WANTS TO CHARGE ME 2000 FOR THEM TO LOOK AT IT SO PLEAS HELP ME WHAT COULD BE WRONG