That bulb most likely isnt designed for a 185s electrial system... could be a lower or higher wattage bulb and its causing it to do this. I put a cheaper higher wattage bulb in my 250r and it ended up melting into the headlight connection. I always seem to learn the hard way with things and now ive gotta redo my headlight harness and just spent 35$ on the correct bulb from Honda.
Mixing gas and haulin' ass
1984 ATC 70 x2
1985 ATC 250R-Ported/Polished, PWK 39mm, V-force 3's, Outerwears air box lid, FMF fatty with DG silencer, DWT wheels, LSR +4 axle, all black plastics
1985 ATC 250R-stock