Honda - Headlight Unit - 33120-KPJ-670

I have an old 1983 Honda CM450A. The problem with these old bikes is that they have an awful, awful sealed beam headlight. The headlight is an uncommon size at 6 3/8", you can't put any old 6.5" or 7" in the existing bucket.

Some research led me to find that the later 2000's Honda cb250's use the same headlight bucket with a replacable h4 bulb headlight, which is this part. This means that you can install this headlight assembly in the existing 1983 cm450a headlight bucket and use your own H4 bulb.

Installing this in place of the old sealed beam assembly was simple. Remove the bolts securing the sealed beam assembly to the stock ring, along with the adjusting screw. This headlight assembly is just about a direct fit in the stock ring, so just reverse the process. I did find that it fits very, very slightly differently in the stock ring than the sealed beam. The edges do not extend quite as far out, but it is almost unnoticeable. Make sure you also purchase the rubber seal to cover the plug where the bulb goes in, the sealed beam assembly does not have this seal.

Typical H4 bulbs draw a load of 55w/60w compared to the sealed beam at 35w/50w so be mindful of the added load on the charging system. I replaced my running gauge bulbs with LED's to slightly offset the higher draw of the new headlight (Cut power consumption by about 10 watts). Be careful of replacing blinker bulbs or marker lights with LED's as most are illegal in stock halogen bulb housings.