The Airheads Beemer Club is a non-profit club reclaiming the 'Legendary Motorcycles of Germany'

Topic-icon Low RPM Charging/Urban Riding

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1 month 5 days ago - 1 month 5 days ago #2628 by 8053
8053 replied the topic: Low RPM Charging/Urban Riding
I can't know for sure what Wobbly's terminology refers to, but, on my early Airheads, there is a secondary bulb socket in the headlight for a small bulb that is illuminated when switched to "parking" light function. Some riders run this way in the daylight to meet the requirement for a daytime headlight without running a full blown headlight bulb in order to reduce the electrical demand. On my '88 R100RS this secondary light was not in the headlight, but under a separate lense cover on the fairing some times called an "eyebrow". Perhaps this sort of thing is what he is alluding to. This may not apply to your 1993, R100R.

It also might be worth looking into the possibility of some kind of parasitic draw on your battery with the key turned off.

Airheads only
Last Edit: 1 month 5 days ago by 8053.

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1 month 2 days ago #2631 by 371
371 replied the topic: Low RPM Charging/Urban Riding
Motorrad Elekrik Omega charging - no alternation to your existing bike, proven technology, and you can put put around all you want.

I was working with Rick (owner of Motorrad Elektrik) at the MOA Rally in West Virginia years ago. Two GS riders from NY City came in. One bought the Omega - and they installed it in the parking lot. His mate came literally running back in and bought an Omega kit too. Charging starts at 1500 RPM.

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  • jhabramson
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1 month 1 day ago #2633 by jhabramson
jhabramson replied the topic: Low RPM Charging/Urban Riding
Thanks everyone for their replies. Since I'm trying to avoid the cost I'll avoid the Omega, the kit is 600 US.

I'm definitely going to try the led's and replacing the brushes on the alternator. Seriously, thanks everyone for their replies.

Best

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1 month 1 day ago #2637 by 371
371 replied the topic: Low RPM Charging/Urban Riding
And worth every penny. It's also more that 450 watts now, but you will have to talk to Rick Jones about that.

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1 month 1 day ago #2642 by Wobbly
Wobbly replied the topic: Low RPM Charging/Urban Riding

jhabramson wrote: Forgive me, but what is the pilot light?


Elementary error on my part. Apologies. Both my bikes (1979 & 1988) have a small bulb in the headland with a 1/4 inch bayonet base. This is duplicated in the small rectangular lens above the HL on models that carry a full fairing. On the British bikes I work on, these are called "pilot" or "parking" lamps. I'm sure the Germans have an equally strange name, but it hasn't entered my lexicon just yet.

The point is, you can fully illuminate your HL reflector and meet the "lights on in daytime" law with a much lower power bulb than the OEM 55W halogen. There is a 20W incandescent bulb used on "daytime running" in 1990 model cars, or you can go LED at about 5W.

The point is this... in a perfect electrical system any reduction in the power used to illuminate the motorcycle, goes toward charging the battery. So if you reduce your lighting load from 100W (total) to 25W, then an extra 75W (about 5A) is available for charging the battery. (By"perfect" we assume that the diode board and brushes allow full alternator output, AND the battery is electrically and mechanically capable of accepting a charge.)

Hope this helps.

Don't hide 'em, Ride 'em !!
#15150

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2 weeks 4 days ago #2706 by 13086
13086 replied the topic: Low RPM Charging/Urban Riding
Motobins in the UK sell a electronic voltage regulator that allows the alternator to put out 14.2 volts. I used one on my R75 cafe build and it worked fine at lower rpms. Most batteries work better with a 14-14.5 Volt charging rate at the battery.

LED's work fine in brake & tailight, and signal lights with a resistor. Headlights are a different animal as the stock reflector doesn't match a LED bulb. The stock output on a airhead ( newer models ) is about 240 Watts.

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