Cause and effect.
Very helpful for troubleshooting to not get them confused. Just because certain bikes are configured certain way (effect), does not mean there are laws that says so (cause):
NO: bikes --> laws
YES: laws --> bikes
For example, you see 3 bikes going down freeway @ 80mph (effect), so can you assume that speed-limit law (cause) is 80mph? Nope. But assuming so can get you into trouble. Here's actual text from Code of Federal Regulations:
Quote:
Title 32 - § 636.28 Special rules for motorcycles/mopeds
(d) Motorcycles/moped headlights and tail lights will be illuminated at anytime the vehicle is being operated.
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I take "operated" to mean:
- it's on public roads
- engine is running
- rider is sitting on bike in approved fashion
- bike is moving or about to move
In which case, your headlight's behavior is perfectly normal and as-designed. It will turn on when you crank engine fast enough to activate headlight relay with power coming from stator-coils.