It should have a cooling fan behind the radiator, they run off a thermostat near (I think/usually) or on the radiator. This may jam partially shut. OR. cooling fan FUSE may have blown.Check this first. A wire direct to cooling fan should prove if it works.Check second. Where radiator hose connects with engine is USUALLY where thermostat is housed. Look up bike model parts online/internet and see for yourself. OR ASK AT A BIKE SHOP. (find a workshop manual)...good luck...
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