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Electrical Upgrade Questions 1984 R100RT

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Steven Johnson
(@steven-johnson)
Posts: 17
Eminent Member Customer Registered
Topic starter
 

@wobbly Sorry, I also should have said the  number of LED posts.


This post was modified 3 weeks ago by Steven Johnson
 
Posted : 09/15/2026 11:12
Stephen Hughes-Jelen
(@r0ckrat)
Posts: 41
Trusted Member Customer Registered
 

Here's an option from Revzilla, but has an external LED driver attached, so not sure about room in the bucket...

https://www.revzilla.com/motorcycle/hogworkz-h4-led-headlight-bulb?sku_id=1329611

 

[Mods added: This bulb should fit and work well]


This post was modified 3 weeks ago 2 times by Richard W
 
Posted : 09/15/2026 11:13
Steven Johnson
(@steven-johnson)
Posts: 17
Eminent Member Customer Registered
Topic starter
 

Posted by: @r0ckrat
↑

Here's an option from Revzilla, but has an external LED driver attached, so not sure about room in the bucket...

 

https://www.revzilla.com/motorcycle/hogworkz-h4-led-headlight-bulb?sku_id=1329611

 

I appreciate the link.

I’d seen those lamps on another site, can’t recall where. And while reviews were generally favorable, I did note a small but consistent number of complaints about longevity.

 

I just now looked at a bulb sold by Cyclops, I am hoping to get an opinion by someone who’s actually used it. I’m also wanting to add a set of their driving/fog lights eventually, after making a few other electrical modifications - plus getting permission from my financial advisor/wife.

 

Cheers

 


 
Posted : 09/15/2026 11:52
Steven Johnson
(@steven-johnson)
Posts: 17
Eminent Member Customer Registered
Topic starter
 

This is the one I will be buying, soon as it’s back in stock:

 

https://www.cyclopsadventuresports.com/Cyclops-100-H4-LED-headlight-bulb-_p_192.html

 

Will report on it once installed. 


This post was modified 3 weeks ago by Steven Johnson
 
Posted : 09/18/2026 12:36
David Elkow
(@4949)
Posts: 417
Honorable Member
 

I have had the Cyclops bulb in my ‘78 R100 for probably 4-5 years. Daytime visibility is outstanding. I don’t do riding at night any longer, so can’t comment there. When I adjusted the headlight aim after installing the bulb, the pattern looked good with a nice cut-off at the top of the low beam.  I did not remove any of the headlight internals. My headlight lives in my Hannigan fairing, so I have all kinds of room behind it. I’m sure that also helps with cooling. The Cyclops seems to be an excellent product. Picture compares halogen vs Cyclops led. 


 
Posted : 09/20/2026 19:28
David Elkow
(@4949)
Posts: 417
Honorable Member
 

Correction - my Cyclops bulb has been installed for 7 years. 


 
Posted : 09/20/2026 19:36
Steven Johnson
(@steven-johnson)
Posts: 17
Eminent Member Customer Registered
Topic starter
 

Posted by: @4949
↑

Correction - my Cyclops bulb has been installed for 7 years. 

Thank you. I’m glad to have a report from someone who has actually used it. They are backordered, but I’ll pick one up when back in stock.

 


 
Posted : 09/20/2026 20:03
chris stone
(@noblenobby)
Posts: 21
Eminent Member
 

hi guys 

great thread I have not gone to LED lights yet, https://www.cyclopsadventuresports.com/ has lots of info 

The wire between B+ and the starter motor if you replace this with a bigger gauge wire will transform things and make new ground wire go from battery to engine mount 

cheers  chris 


 
Posted : 09/25/2026 10:08
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