depends on where you live, Jon
most motor vehicle equipment laws are universal, but each state has specific 'wishes', your local Motor Vehicle Division office should be able to tell you details, but ...
in general required almost everywhere:
1. working headlight
2. working taillight
3. license plate light
4. horn
5. rearview mirror/s
6. muffler
not all states require:
1. brake light
2. DOT legal tires
3. turn signals
4. speedometer
Yeah I dont know ifv the CRF100 will be able to become street legal. This is because the 100 is an awfully small dirtbike and if you want to use it on the highway I doubt it will be fast enough and if you have knobby tires you would probablly have to change them to more worn down tires so they grip
Stock CRF 80F(except for being bored out)
Maybe new renthal bars soon
Big Gun exhaust system soon