I recently bought a 1981 XJ 650 with 13K miles. I am very pleased with the bike. However the head light was very dim. I bought a 55/60 watt halogen conversion unit with a H-4 bulb from JC Whitney. It is a very simple conversion, just replace the original head light and plug in the factory connector. JC Whitney has higher wattage H-4 bulbs but the 55/60 watt bulb gives enought light so I donĀ“t out run the light at nite.