2008 Polaris ATV Predator 50, Sportsman Outlaw 90 Service Manual, Page 165Get this manual
ELECTRICAL Battery Storage
Whenever the vehicle is not used for period of three months or more, remove the battery from the vehicle, ensure that it's fully charged, and store it out of the sun in cool, dry placeCheck battery voltage each month during storage and recharge as needed to maintain full charge
Starter Motor Service
The starter motor is complete service partIf it is determined that the starter motor is the failed part, replace as neededSee the parts manual for correct part numbersO-ring
STARTER SYSTEM
Starter Relay