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Old 09-14-2014, 11:05 PM   #1
Evo1 OP
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BMW headlight queries - conversions

Hi gents.
I'm looking at running an early (eg R51 or R69) style headlight on a later R100. Reason being that I want to make my bike look older and run the motogadget speedo in the headlight.

Is the original headlight lamp/lens a standard size that would enable a later more powerful lamp to be fitted in place? Ie 7inch etc.

Is there something obvious to the ADV community that would stop this from working? The second hand lamp units seem to be ~$500+ so I don't want to buy one and then realise this won't work!

Thanks!
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Old 09-15-2014, 01:08 AM   #2
disston
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Anything is doable given enough time and money.

Don't know what the size is in width but they use different ears. I think you should try and get a /5 headlight? Has the look you want but not as old and dear as the ones you mention.

If it's look you want also use the /5 switches.

Plan on spending at least a $1000 for parts.
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Old 09-15-2014, 02:27 AM   #3
Evo1 OP
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Quote:
Originally Posted by disston View Post
Anything is doable given enough time and money.

Don't know what the size is in width but they use different ears. I think you should try and get a /5 headlight? Has the look you want but not as old and dear as the ones you mention.

If it's look you want also use the /5 switches.

Plan on spending at least a $1000 for parts.
Thanks disston.

I was going to use the 77 R100 ears and just use shims to make up any difference. Looking at my Dad's R25, they seem a similar diameter.

Unfortunately I can't remove his to trial fit it (he'd kill me!).

I'm guessing the earlier bikes were 6V? And the later airheads were 12? Would that cause any problems running through the stock lens/light? I'm guessing the beam would be pretty poor, hence why I'm looking to upgrade it.

As for the cost, I have the motogadget speedo already. If I can get a bucket for ~$500 and a lens/light for a few hundred, I'll be happy.

My project bike didn't come with instruments. The used prices of airhead speedos is crazy, so I decided to go motogadget instead.
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Old 09-15-2014, 03:15 AM   #4
190e
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Don't know about older ones but /5's can be updated to a modern H4 bulb by using a reflector and lens from an R65.
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Old 09-15-2014, 07:05 AM   #5
extheflow
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Quote:
Originally Posted by 190e View Post
Don't know about older ones but /5's can be updated to a modern H4 bulb by using a reflector and lens from an R65.
you must have missed This Thread

There's an H4 bulb with a p45t base thats a direct fit for the /5 hardware. It's an easy affair going to H4 using that bulb and a couple of relays.

And since there aren't enough crappy hand drawn schematics I will add mine here.
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Old 09-15-2014, 07:16 AM   #6
pkboxer
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Seen this thread?

Have you seen this recent thread?

http://advrider.com/forums/showthread.php?t=1008445

Much cheaper than BMW parts.

You really need the /5 ears, they are longer (as is the rear of the earlier/Chinese bucket)

Also, at least on the one I bought, these are 7" headlights and give you many options for sealed headlights ect..

The /5 buckets, and assume /2, are like 6.75"

I only had to dremel the instrument hole 1mm bigger to take the standard Speedhut instrument that I used.

I'll try to find if I have an image I can link to.
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Old 09-15-2014, 07:43 AM   #7
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My pic



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Old 09-15-2014, 07:49 AM   #8
cycleman2
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Quote:
Originally Posted by 190e View Post
Don't know about older ones but /5's can be updated to a modern H4 bulb by using a reflector and lens from an R65.
I upgraded my /5 headlight with the more modern H4 kit. That consisted of the lens, reflector and bulb. That is the easiest way to go if you can find the kit out there. It is just a plug and play and you would likely need the /5 ears as the early headlight buckets where longer that the /6 or /7.

From looking at the picture of the /2 headlight there is very little difference between the /2 & /5 from outwards appearance. You'd have to measure the speedo hole to see if they are the same.
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Old 09-16-2014, 08:46 PM   #9
Evo1 OP
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Thanks very much for your great information!
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