DrJ
Over 1,000 Posts
I have an H4 bulb conversion on my CB350 headlight with 60/55 watt rating. Only recently have I been doing longer night rides and realized it doesn't work well with the stock charging system. The original sealed beam unit is rated at 35/25 watts, much lower than the H4. The H4 draws too much power and depletes the battery faster than it can charge. First symptons are the signals and horn seizes to work. Then the idle starts slowing down. Luckily the bike will still run and the headlight still works even when the battery drains to 9.5 volts but the revs need to be kept up or it will stall. So for anyone considering switching to an H4, there is a charging kit that will work with an H4 that I may get.
http://www.ricksmotorsportelectrics.com/press2007/2007-09-11Classic_honda_kit.pdf
http://www.ricksmotorsportelectrics.com/press2007/2007-09-11Classic_honda_kit.pdf