What's the battery for then? I've never seen the fan kick on.
The battery powers all LIGHTS, in the event the engine is off, and the alternator inoperative; also, the battery powers the electric cooling fan, even when the engine is off.
The ability for lights to operate with the engine off remains a safety requirement in some (most, I'd imagine) states. For example, a night flameout on a dark road might put the bike and its rider in jeopardy, with no lights for conspicuity.
No battery may mean there's no way for the fan to run.
Excellent point, tj!
Without extraordinary wiring changes, the absence of a battery might prevent fan operation, one might think.
The stator COULD be wired to provide 12 VDC to the battery CIRCUIT, powering the cooling fan, but . . . removal of the battery (without wiring changes) may deny that possibility.
Similarly, I'd expect no lights (headlight, tail light, brake light, turn signals) with no battery, absent some wiring accommodation.
Must study that KLR250 wiring diagram!