Author Topic: 1977 RD250D flasher cancelling unit  (Read 246 times)

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Offline Jeffw

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1977 RD250D flasher cancelling unit
« on: January 10, 2018, 03:28:08 PM »
Hi all

Putting a new loom on a German rd250d, the flasher cancelling unit is missing, can I go ahead and leave the unit out and the indicators still work or will I have to modify the loom?
Cheers
Jeff

Offline GAZZATT2

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Re: 1977 RD250D flasher cancelling unit
« Reply #1 on: January 10, 2018, 04:17:49 PM »
Leave of will work without
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Offline 5port

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Re: 1977 RD250D flasher cancelling unit
« Reply #2 on: January 10, 2018, 04:58:51 PM »
Jeff, the self cancelling indicators are worth having!  The cancelling unit is the same for UK/European RD250/400 models, 1E7-83395-01.  Decent condition used ones seem to be reliable and, you should get one for a fair price.  Cheers

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Offline mervin

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Re: 1977 RD250D flasher cancelling unit
« Reply #3 on: January 10, 2018, 05:35:31 PM »
The german bikes never had the self cancelling indicators  AFAIK
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Offline Jeffw

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Re: 1977 RD250D flasher cancelling unit
« Reply #4 on: January 10, 2018, 06:10:30 PM »
Thanks for the info, is there 2 parts to the unit, the other part being a sensor? That's what the wiring diagram is showing?

Offline 5port

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Re: 1977 RD250D flasher cancelling unit
« Reply #5 on: January 10, 2018, 07:38:49 PM »
The german bikes never had the self cancelling indicators  AFAIK

Yes, seems like the W.German and the Finnish didn't have the self cancel function but, everyone else did.  You can still fit the cancel unit if your loom is wired for it and, the prong to mount it is there on my W.German 250C.  Jeff, the sensor is fitted on the back of the speedometer.  Hope that helps!  :)

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Offline Jeffw

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Re: 1977 RD250D flasher cancelling unit
« Reply #6 on: January 10, 2018, 08:17:14 PM »
I don’t have the sensor or the cancelling unit, I have a new loom and it provides the wires for both sensor and the unit, I think I’ll go ahead and wire it without self cancelling indicators and if one comes up at least I’ll,have the loom ready for it.
Thanks for all your help guys

Cheers

Jeff

Offline Richard S

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Re: 1977 RD250D flasher cancelling unit
« Reply #7 on: January 12, 2018, 11:04:41 AM »
Can anyone explain how the reed switch works please.

Offline Barnett

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Re: 1977 RD250D flasher cancelling unitd
« Reply #8 on: January 12, 2018, 11:02:34 PM »
Reed switch is triggered by a magnet attached to the internal rotating parts of the speedo mech. Reed switches on and off or I should say open and closed, this sends a pulse to the mysterious oblong box behind the steering stem, so in effect just a counter, faster you go the more counts per second. So the box knows how far you have traveled, auto cancel is based on time and distance traveled. The reed switch is very simple, they are common in house alarm door entry/exit sensors, if you can find a unit small enough you can make your own, maplin or rs components are two possibilities I would recon. The switches get a hard life on the bike and dont last forever. Oh and as far as I remember the switch is a normally closed reed, i.e. Opens in presence of the magnetic field and shuts when field not present, maybe someone could check theirs if they have the std reed fitted. You will need magnifying glass!
« Last Edit: January 12, 2018, 11:06:51 PM by Barnett »
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Offline Mark Leadbeatter

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Re: 1977 RD250D flasher cancelling unit
« Reply #9 on: January 12, 2018, 11:19:08 PM »
I managed to pick up a NOS reed switch on Evilbay last year for about $40 iirc.

I am hoping this will help me to have a fully functioning self cancel system on my 400E project.
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