Polaris Predator 50 Owner's Manual page 159

Drive Chain Inspection and Adjustment (50cc Models)
1. Check the amount of chain
slack by moving the vehicle
slightly forward to gain slack
at the top side of the chain.
2. The chain should have
1/4"-1/2" (6-12 mm)
deflection. If the chain needs
adjustment, use the procedure
on page 158.
Maintenance
157