The cooling system is of paramount importance for reliability, if the coolant pump has become scaled up with lime and other contamination it will not be giving its best, and whilst flushing can improve matters, it may be better to refurbish the assembly with new replacement parts, where required, and ensure the coolant is of the recommended type at all times.
Related consumables & components:
Add as many items as you wish to the same shopping cart, new O-rings 9321033133 9321021190 9321015566 & bolts 9131106040 9131106020 for example, and still only pay the same single fixed price shipping cost. 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. If you are considering engine work then give this pro-workshop gasket sealant 08C70K0234M a try?