I know things... A lot of things.
Join Date: Feb 2015
Motorcycle: GSXR 750 K4
Re: k6 600 head light problems
13.3V at the battery at 5000rpm is actually below spec. It shouldn't charge the battery properly, so perhaps you're not measuring correctly? I can't think of anything else that would blow bulbs at that rate, other than improper bulb type, or a faulty batch of bulbs of course. If you are measuring correctly and leaving aside the charging aspect for the time being, perhaps it'd be a good idea, to blip the throttle and see what the voltage is doing at higher engine speeds. No need to reach the limiter, of course.