Author Topic: Yamaha DT125E. (1GO)  (Read 1155 times)

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Offline tractorman

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Yamaha DT125E. (1GO)
« on: April 20, 2016, 10:36:48 PM »
Just bought a very nice DT125E, the electric start model, for my wife, but the electric start doesn't work. I have replaced the brushes but still no go. The solenoid clicks when you press the button, but that's all. I took the regulator cover off and closed one set of contacts with a screw driver and the engine turned over for a second but then blew a fuse. Any help appreciated. The battery is well charged by the way.

Offline martin1957

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Re: Yamaha DT125E. (1GO)
« Reply #1 on: April 21, 2016, 08:47:12 AM »
Take care!  On some vehicles with regulator bobbins, eg mechanical relay type, if you push the relay armatures they can latch in and burn things out or blow fuses! Find out how it is supposed to work and check each step until you find the step or stage nnot working. Saying that, check the battery is 12.6Volts, charged, check all the wiring is connected, and to the correct points, and that the brushes are fitted correctly, insulated correctly, and have plenty of length left.

You could carefully clean the regulator contacts with some thin card. Dont go filing them - that can upset the regulation point of the charging system.
« Last Edit: April 21, 2016, 08:48:48 AM by martin1957 »
Electronic Test Engineer (Avionics), Age 60, Owned P50, PC50, SS50z, YAS1, YDS7, RD350B till 1978, then KH400 from 2009 onwards. Have a fully restored YAS1 on the road, and an AT3 import to MoT.

Offline tractorman

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Re: Yamaha DT125E. (1GO)
« Reply #2 on: April 21, 2016, 03:45:45 PM »
Thanks for the info. I am waiting for a manual to arrive so I can check the wiring diagram, although I presume it will be similar to the RD200, but just one set of points. The regulator looked very clean inside. I think one side of the regulator deals with charging and the other with the starter.

Offline tractorman

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Re: Yamaha DT125E. (1GO)
« Reply #3 on: April 22, 2016, 09:36:11 PM »
Seems like someone has buggered about with the starter system!! On the starter side you have the solenoid, and the regulater separate. Luckily my GT185 uses the same system so I can use it for reference. The solenoid should connect straight to the battery then the regulater, then the generator. Seems they have bypassed the solenoid to battery part and removed the wire to the starter dynamo!! All a learning curve!

Offline rocket

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Re: Yamaha DT125E. (1GO)
« Reply #4 on: November 11, 2017, 03:06:08 PM »
hi
can a post a photo of the back end specifically the rear light cluster

cheers
RD200 x 2
GT125 x 2
GSR750
X7

Offline tractorman

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Re: Yamaha DT125E. (1GO)
« Reply #5 on: November 11, 2017, 07:33:38 PM »
Sorry, if you want a photo of the rear light, I cant post photos. The DT125E used a round tail light, the same as USA RD250a/b. Have you got a DT125E?

Offline rocket

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Re: Yamaha DT125E. (1GO)
« Reply #6 on: November 15, 2017, 07:01:27 PM »
HI
Yes but it is a French model that I am changing to UK spec. 1 owner with 3000 miles
RD200 x 2
GT125 x 2
GSR750
X7

Offline tractorman

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Re: Yamaha DT125E. (1GO)
« Reply #7 on: November 16, 2017, 09:49:10 AM »
The only differences I can see from the parts book, between UK 1GO and French 1GO, are the headlamp rim, tail light and strangely, a 16 tooth front sprocket instead of the UK 15. Be very careful when ordering parts, and make sure its the 1GO you are ordering for. Yambits do a lot of stuff. Also make sure if you set the timing, to have the advance weights fully out.

Offline rocket

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Re: Yamaha DT125E. (1GO)
« Reply #8 on: November 16, 2017, 06:28:59 PM »
Cheers for that I have a parts book on its way. Is the rear light bracket suppose to be chrome or silver
RD200 x 2
GT125 x 2
GSR750
X7

Offline tractorman

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Re: Yamaha DT125E. (1GO)
« Reply #9 on: November 16, 2017, 06:42:20 PM »
The one on my wifes is painted silver.

Offline rocket

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Re: Yamaha DT125E. (1GO)
« Reply #10 on: November 19, 2017, 06:31:54 PM »
Hi Sorry to myther but I need to get this bike right.
Does the rear light unit have 2 small reflectors either side of the rear light. and the sticker on the exhaust. doe that say 125 or enduro

cheers
Martin
RD200 x 2
GT125 x 2
GSR750
X7

Offline Blackhat400

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Re: Yamaha DT125E. (1GO)
« Reply #11 on: November 19, 2017, 07:03:11 PM »

Offline tractorman

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Re: Yamaha DT125E. (1GO)
« Reply #12 on: November 19, 2017, 10:04:54 PM »
Yes, reflectors either side of tail light and exhaust has 125 on chrome plate.

Offline martin1957

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Re: Yamaha DT125E. (1GO)
« Reply #13 on: November 21, 2017, 12:19:48 PM »
I might have got this wrong, but in the US, there was the AT1, AT2, and AT3. Did the AT3 ever make it to the UK? Or is the DT125 the UK version of the AT3?

How did the A,B, C suffixes change the models?

The web site Yamaha-enduros.com is a great web site for these bikes, see the specifications bit.

Just wondering how the UK versions differed from the American ones.

I have an US import AT3 1972, blue tank, short seat, with indicators.
Electronic Test Engineer (Avionics), Age 60, Owned P50, PC50, SS50z, YAS1, YDS7, RD350B till 1978, then KH400 from 2009 onwards. Have a fully restored YAS1 on the road, and an AT3 import to MoT.

Offline tractorman

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Re: Yamaha DT125E. (1GO)
« Reply #14 on: November 21, 2017, 12:55:22 PM »
The UK DT125E was the basically the same as the US DT125 A/B/C.  It was the only model to come to UK with electric start, and only lasted here from 78/79.( obviously there are later registered ones) The US DT125E is the same as UK DT125MX. All very confusing when buying parts. Don't think the UK got the AT models, but the engine is pretty much the same as the 1GO engine. My wifes DT125E was painted in the orange and white of the earlier models and looks lovely, The 1GOs were black, blue and white I think.