I wonder if we could put together a list of the lampbulbs used on Ks and early XLs.
What got me started on this: I needed both headlight and taillight bulbs for my '62 CH. But none of the bulbs I could find quite matched what was in the 1959 Service Manual (see attachment).
The trade 1158 taillamp bulb appears to be a 17/5 watt, which is somewhat close to the Harley 68165-47's 21/3 watt.
The trade 4020 headlamp is a 30/30 Watt, which is nowhere close to the Harley 67717-59's 40/35 Watts.
The trade 4031 headlamp is a 45/35 Watt, which is closer to the Harley 67717-59's 40/35 Watts.
The 4031 is also close to the Big Twin and Servi-car 67717-48A 50/40 Watts.
What the heck were the originals? Were there really a bunch of light bulbs that are just totally unavailable now, and things like the 1158 and 4020 the only ones still produced?
Both modern and NOS 4020's are fairly cheap. The 4031, when you can find them, are really expensive. The only other thing they seem to fit is really early Army Jeeps. But they're pretty close to the original wattage, which might come in handy when that deer steps into your path late at night. Of course, most of us don't ride our antiques late at night, but it might come in handy.
Can you shed any light (pun intended) on the 6v bulbs used on these bikes ???
Dave