Well, that sucks but I know how you feel. I purchased my Prowler broken as well. I figured it was going to be broken bevel gears from the research I did. But when I tore the motor apart I found in addition to broken bevels, it had cracked the case and bent the through shaft. So it ended up costing me more than I had hoped. One recommendation if you do find another motor is make sure you install the new style bevel gears to hopefully avoid this issue from happening again.....
-2011 Polaris RZR-4 800 (SOLD)
-1999 Polaris Sportsman 500 ATV
-2006 AC Prowler 650XT (SOLD)-- updated bevel gears, updated oil pump driven gear, 4 wheel disc brakes, line lock E-brake, Papa Slap clutch, Xentec HID's, Dynatek CDI, Warn skid plates, Intellitronix gauges, 2010 intake/cvt duct work and dust shield, RZR seats, Bestop folding windshield, full cab kit, rear cage and rear seats (4 seater)