2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 49Get this manual
MAINTENANCE Controls Wheels
Inspect all wheels for runout or damageCheck wheel nuts and ensure they are tightDo not over tighten the wheel nuts
WARNING
Operating an ATV with worn tires will increase the possibility of the vehicle skidding and possible loss of controlWorn tires can cause an accidentAlways replace tires when the tread depth measures 18" (.3 cm) or lessInspect all wheels for runout or damageCheck wheel nuts and ensure they are tightDo not over tighten the wheel nuts
Check controls for proper operation, positioning and adjustmentBrake control and switch must be positioned to allow brake lever to travel throughout entire range without contacting switch bodyThrottle assembly clamp