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TOPIC: Yamaha 1969 at-1

Yamaha 1969 at-1 26 May 2019 09:47 #1

  • Animal44
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Hi guys I'm going to strip back all the wiring for now no indicators headlights rear lights so on you get the idea ,
All I want to do at the moment is get the bike running so stupid question is ????
What do I need to do just to have the bike start up and run ?
Thanks guys
Dave

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Yamaha 1969 at-1 26 May 2019 10:16 #2

  • MarkT
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I remember there was some confusion on what you have... 6 volt kick start only magneto (non-USA model) or 12v generator electric start model?

IIRC it was a 12 volt generator model. If so, you'll need a good 12 volt battery connected to the ignition circuit. This model has a Kettering type points ignition very much like was used in cars for many decades... Ignition coil has two small wires to it. 12v to one side of ignition coil and other small wire on coil goes to points (usually orange wire on Yamaha)

If a magneto model, the magneto does not require a battery and there is just one black wire from mag to ignition coil... magneto ignition coil only has one small wire to it.

(and of course both types of ignition coils also have a secondary wire to the spark plug)

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Yamaha 1969 at-1 26 May 2019 10:19 #3

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cycles.evanfell.com/2010/03/simple-motor...ers-and-cafe-racers/
This is a good place to start.
Then here for cross reference maybe?
www.slimduck.com/at1125_wiring.html

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Yamaha 1969 at-1 26 May 2019 14:04 #4

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Hi guys thanks for the info I'm going to be trying to get the bike started soon so thought as the wiring is a bit crap probably get another loom so thought I'd concentrate on trying to get it to run for now .
I'm surprised I didn't get any comments like
You need petrol
You need a spark plug or battery lol
And so on
Thanks for the info
Dave
Oh by the way must say this has got to be the best site for help when you need it very impressed and very thankful

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Yamaha 1969 at-1 26 May 2019 14:43 #5

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Is it an electric start. We need to know this.
Capt Dave

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Yamaha 1969 at-1 26 May 2019 19:40 #6

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If you are not sure if it's 12v or 6v just post a picture of the bike on the shifter side. The 6v has a lot smaller ignition cover then the 12v I believe. others could verify. But a picture would be nice anyways.

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Yamaha 1969 at-1 27 May 2019 01:37 #7

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Hi everyone yes the bike is a electric start and yes it's 12 v I'll take some pics in a bit so you can see what I'm up against ,you're replies should be interesting.its not been started for over 30 years ive stripped and rebuilt the engine the wiring is original and shabby as you will see so got some sorting out to do aswell.
Thanks
Dave

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Yamaha 1969 at-1 27 May 2019 02:11 #8

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Hi guys as you can see it's a 12 v the wiring is crap so probably going to have redo it but I did get the bike in bits in a load of boxes so I've done loads so far,the frame was bare,so basically I've rebuilt the engine scrubbed and resprayed the frame fitted the engine/wheels / forks /handle bars and so on the ignition is not fitted yet as been doing other stuff to it
Hopes this helps I'll send a pic of what it looks like at the mo
Thanks guys
Dave
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Yamaha 1969 at-1 27 May 2019 02:18 #9

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Here it is as it stands at the moment today ,fitted the carb /oil pump /exhaust today so from boxes of bits in a garage to this I haven't done to bad so far .
Thanks
Dave

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Yamaha 1969 at-1 27 May 2019 02:21 #10

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Here it is as it stands at the moment today ,fitted the carb /oil pump /exhaust today so from boxes of bits in a garage to this I haven't done to bad so far .
Thanks
Dave
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