Overheating engines are no laughing matter, causing the owner, never mind the engine, to get all steamed up! Usually a simple fix is all that is required, a new rad cap or thermostat is quite often all it takes.
However, if a previous owner has used incorrect coolant or ignored service schedules requiring a purging and replenishing of the correct coolant at set kilometers/mileage then more problems can be expected.
A thorough inspection and overhaul of the cooling system can be a "stitch in time saves nine". Certainly less costly then rebuilding an engine with a blown head-gasket with all the problems that can lead to.
Engine cooling related components you may wish to consider:
Add as many items as you wish to the same shopping cart, new bolts 5GJ126750095817060259502206012 & hose clamps 9045032X039046711090 for example, and still only pay the same single fixed price shipping cost.
Pro-workshop gasket sealant, 08C70K0234M - to complete the job like a professional.
Please be aware that this component may have other applications within the Yamaha model range; so please check the part-numbers ordered are correct for your model.