Hose 5

Radiators usually fail because of the wrong coolant being used, or failing to purge and replenish coolant that has been in the system too long, or physical damage and perforation.
Whatever the reason the radiator system requires attention, the best results can be achieved by renewing the radiator and as many of the related parts as possible - hoses, hose-clips perhaps even a new fan assembly?
Other coolant related parts you may wish to consider:

5JW1246100
5JW1259000
5JW1240501
5JW1244E00
5JW1243F00
5JW1265900
5JW1266800
5JW1246400
5JW1258900
5JW1255100
5JW1255200
5JW1243A00
5JW1243E00
5JW1244G00
5JW2187100
9044509009
9046409129
9046460067
9046413249
5JW2187300
5DM2837100

Add as many components as you wish to the same shopping cart, new rad cap 3XP1246200 bolts 9700706012 9502706012 9581706030 & hose clips 9045038040 9045028001 for example, and still only pay the same single fixed price shipping cost.

Pro-workshop gasket sealant 08C70K0234M easy to apply with perfect results.

This component may have other applications within the Yamaha model range, so check by part number rather than the description.