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Yamaha dt 125 lc mk1 with a rd 125 lc mk 1 engine

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Rocknroll0
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PostPosted: 20:31 - 14 Mar 2019    Post subject: Yamaha dt 125 lc mk1 with a rd 125 lc mk 1 engine Reply with quote

Hi guys I am after some info on how to wire up the generator I have a Yamaha dt 125 lc mk1 1982 and I have rebuilt a Yamaha rd 125 lc mk1
Engine that I fitted into the dt I am having issues with the generator wires there are to many on the rd engine. I am using all the rd bits coil regular, cdi, generator, I have upgraded to 12 volts. I need to no what wires go weíre. The manual doesnít tell you the information I need so help needed please thanks Andy
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mpd72 CPT
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PostPosted: 22:01 - 14 Mar 2019    Post subject: Reply with quote

The engines are near identical. Canít you just use the stator which is correct for the wiring, rather than pissing about rewiring it?
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Rocknroll0
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PostPosted: 22:23 - 14 Mar 2019    Post subject: . Reply with quote

Hi thanks for the reply. I havenít got any parts for the dt I bought a rd
Engine and rebuilt it. I will have to look out for the parts I need I thought if I could rewire it job done.
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stevo as b4
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PostPosted: 23:45 - 14 Mar 2019    Post subject: Reply with quote

I presume you've used the RD stator instead of the DT one because it's 12v and not 6v on the DT? If so can't you look at the Rd wiring diagram and copy the outputs onto your DT loom, even if the colours are different between the two wiring diagrams?
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mpd72 CPT
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PostPosted: 00:09 - 15 Mar 2019    Post subject: Reply with quote

stevo as b4 wrote:
I presume you've used the RD stator instead of the DT one because it's 12v and not 6v on the DT? If so can't you look at the Rd wiring diagram and copy the outputs onto your DT loom, even if the colours are different between the two wiring diagrams?


Surely a 1982 DT125 LC would be 12v and pretty much the same engine as the RD125 LC of the time? Just buy a DT125LC mk1 stator and use that with the correct wiring connectors.

Iím pretty sure even my older Air cooled 78 DT-E125 was 12v.
Was this DT a UK model?
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stevo as b4
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PostPosted: 01:51 - 15 Mar 2019    Post subject: Reply with quote

As weird as it sounds I'm fairly sure that the earlier cantilever mono shock DT125LC has a 6v electrical system. As you said the RDLC has always been 12v, so it stands that the stator could be different and the wiring outputs might not match up as plug and play.
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GT200Fan79
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PostPosted: 07:44 - 15 Mar 2019    Post subject: Reply with quote

Yes the original DT is 6V for some inane reason known only to Yamaha,

Iím wondering if the extra wires are because the RD has a 3 phase charging system and battery lights? As far as I know Yamaha only deceided to do away with AC lighting late in the DTís model life? Basically youíll need to use the loom and wiring components that match your stator, or find the wiring diagram for the bike your stator is from and make your own.

The DT125E is an oddball that used a 12v DC system like that on the RD200 complete with electrical starting.
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Sister Sledge
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PostPosted: 07:47 - 15 Mar 2019    Post subject: Reply with quote

My failing memory tells me there were several differences in the two engines and they could not be a direct swap - must have been electrical then!

If the RD engine is spliced into the 6v harness will it not bring in additional problems? Obviously bulbs will blow but things such as the voltage regulator and CDI will blow too?
I'd try and get an early DT generator/stator thing and put that into the RD engine? Given how popular the bikes were, is there not mention of this across the internet??
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mpd72 CPT
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PostPosted: 11:23 - 15 Mar 2019    Post subject: Reply with quote

GT200Fan79 wrote:


The DT125E is an oddball that used a 12v DC system like that on the RD200 complete with electrical starting.


Thinking about it, my 1978 DT-125E would have been 12V as they were electric start, so that makes sense now.

There was a thread about this on here previously

https://www.bikechatforums.com/viewtopic.php?t=271405
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