How Often Should I Replace Motorcycle Coolant?

Generally, you should replace motorcycle coolant every two years or 24,000 miles. If you’re using long-life coolant, it can last up to five years or 50,000 miles.
The exact interval depends on your bike’s manual, since different manufacturers and coolant types (green ethylene glycol, orange/pink OAT, or hybrid blends) have different lifespans.
Riding conditions also play a role—hard riding or hot weather may require more frequent changes.
If your coolant looks brown or cloudy, smells bad, levels keep dropping, or your bike runs hotter than normal, it’s time for a change, regardless of mileage.

This article: How Often Should You Replace Motorcycle Coolant? should be helpful to you.

 

@StephenMotoFun Yes about every two years. Same as Brake fluid. @William_Triumph has supplied you with an invaluable schedule.

 

I change every 3-4 years running the long life OAT stuff.
If the coolant looks brown it’s down to corrosion in the cooling system and bad smelling coolant can be indicative of head gasket problems. Even in a healthy cooling system, the anti-corrosion and freezing/cooling properties of the coolant will deteriorate over time.
I buy the concentrate and dilute with tap water. Hard water can be a problem in building pipe work and storage tanks etc but the amount of impurities in the water in a vehicle cooling system is negligible IMO so I’ve never bothered buying distilled water.