I'm pretty sure the Gen 1, took an H4 bulb. There are H4 LED bulbs out there, that are plug and play, and look for one that is specific to motorcycles. It might work better. I think Monster is one of the brand names. I put one of them in my older BMW and it worked well. The trick with converting to a LED bulb is how it is going to work with your reflector. No doubt others will chime in with more info.
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