Engine cooling systems are only as good as their weakest link - radiator, hose clips, water hose, even corroding fasteners can get you all steamed up if not perfect!
If in doubt simply replace the old degraded parts with new components. It will be less expensive than the damage caused to the engine by overheating!
Other parts you may wish to consider, both mechanical and cosmetic engine cooling related parts:
This component may have other, sometimes unrelated applications within the Yamaha model range, so please always check by the part-number rather than the description prior to ordering.