Yamaha RAPTOR YFM660RP Owner's Manual page 122

4. Remove the radiator cap.
1. Radiator cap
5. Remove the coolant reservoir cap.
6. Disconnect the hose on the coolant res-
ervoir side, and then drain the coolant
from the coolant reservoir.
1. Coolant reservoir cap
7. After draining the coolant, thoroughly
flush the cooling system with clean tap
water.
8. Replace the coolant drain bolt washer if it
is damaged, and then tighten the coolant
drain bolt to the specified torque.
8-13
2. Hose