I have an 05 wr450 (uk spec) which i have owned from new. I use it for trail riding and enduros, i also use it on the road in supermotard trim! Last month it suddenly started blowing bulbs, i got my meter out and checked the voltage at the headlight it was 24volts @5000rpm , i thought it may be the regulator but after looking at the lighting circuit it does not use it! The regulator/rectifier on my bike deals with the ignition and charging side of things (DC) and my lighting circuit is unregulated (AC) which i find strange! A friend of mine has the exact same model bike as me and his is wired up exactly the same as mine (uk spec) yet he has 14volts max at the headlight, its as if my lighting coil has suddenly started producing more power. anyone got any ideas what could be causing this problem!!