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.