Too early to tell here in California, but found out from my brother in law that Arizona does require smog check when registering bike (my 92 Katana should have passed, but did not the first time...he did the tune (valve lash, carb sync and spark plug change) and it passed...not bad for an essentially stock bike with about 55,000 miles. Only went thru one battery, fuel petcock, routine LOFs (dino-oil 10-40W lubes engine, primary/clutch and tranny) and that inline 4 sportbike is still running crisp...!