Where to mount the starter relay - '80 R100RS

[ezwicky]

Hi all,

I need a reminder where to mount the starter relay on my 1980 R100RS. I forgot to take a picture when I stripped the barn-find bike down over a year and a half ago. The frame tab has four holes and I can't remember what they are all used for. Any reminders are welcome and appreciated.

 

[melville]

This is my 1978 /7:

The starter relay is toward the rear. The front relay is the horn relay.

 

[ezwicky]

Thanks! I don't think I have a horn relay. I don't remember removing one and my wiring diagrams don't show one. And the wiring harness doesn't have a socket for one.

What's mounted to the other two holes in the bracket?

Thanks again,

Eric

 

[kinterridge]

The horn relay is only if you have the dual horn set up. The starter relay mount on the same bracket. On my 77 it is mounted there.

 

[ezwicky]

I do have two horns. One mounted to a tab on each frame downtube. Or did you mean a dual horn like the Fiamms?

Assuming no horn relay, in my case, which hole does the starter relay socket attach to? Does it matter? Anything else goes into the other three holes?

 

[kinterridge]

Yes, like the Fiamms.

 

[melville]

I would use the rearmost threaded hole for your starter relay.

 

[gtgt_bangbang]

you could take the green-field approach.
For a couple reasons I separated the relay blocks and spread them around

I used that frame bracket and a couple left over rubber mounts ( diode board type) as spacers.
The existing wires all fit.

Why yes ,that digital ignition box BRACKET is a stainless blade , bent up a bit,
from the Hardbaord Frieght oscillating saw collection

and the adjustable voltage regulator is at a funky angle for ease of adjusting w/out struggle , until final dial in
then it can be moved to its normal inclination

 

[ezwicky]

Clean! That looks like the stage my bike is at. Thanks for the tips and pics.

 

[gtgt_bangbang]

That looks like the stage my bike is at.

humbled ! nice work there.



Favorite tweek on mine was routing the main harness / starter wires between the coils, requiring a little hammer & tong action to brackets for breathing room .... right about where the inspiration for yours seems to be growing .

Favorite excuse was to keep the routing tight / minimalist .

Real reason was "couldn't make the rubber wire guide-block fit back where it was supposed to , & it was a hassle installing while still adjusting wires"

I made a spade lug for a ground above coils too, cut out from a copper ground clamp ala home depot

There are no new wires on mine IIR (specifically when breaking up the relay block)
except for the boyer 's & the replacement starter cable & batt->starter relay( 87a ) (bulky red wires)

 

[eastbay]

Here's the set up on my '83 R80ST. the silver box [voltage regulator?] is attached to bottom 2 holes and the turn signal relay is attached to one of the top holes. 1 hole is unused.

 

[ezwicky]

Thanks eastbay. Your brackets are different from mine, but I appreciate you taking the time and posting the pics!