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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #16  
Old 11 Aug 2007
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buttons and sparks

Quote:
Originally Posted by aukeboss View Post
So the bike only fires when the starter button is pushed, but immediately cuts out when the button is released?
Then I preliminarily conclude that sparks are only generated when the starter button is pushed ..... try the following: start with starter, till engine fires, then (acrobatically) unplug the wire from starter button to solenoid, all the while pushing on the starter button. Does the engine keep running?

Let us know ...

Auke
Already checked that the sparks continue once the starter button is released?

Auke
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  #17  
Old 11 Aug 2007
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Ignition Problem.

Hi.
The principal reason your engine will not start is that you are sill using the 3TB flywheel.

The 3TB flywheel:

...has a different magnet layout & so will not work in phase with the poles on the 1VJ/3AJ type stator - (though this is not the main problem)

...has a much smaller outside diameter & has the raised trigger points in totally different positions - so...even if the raised trigger points were close enough to be able to trigger the pickup coil (the black 2 bolt, 3 wire device thats fixes to the inside top right of the stator cover) - which they're not , due to the smaller diameter or the flywheel - it wouldn't be triggered in the correct way anyway.

The 1VJ/3AJ flywheel, starter one-way clutch and spacer will fit straight on to a 3TB crank tail with no problems at all. Put this lot on your 3TB & assuming everything else is in good condition, you will have a spark & it should start. If not, give me a ring on 01205 871945 & I'll run through some simple checks over the phone.

I hope this helps.
Best wishes.
David Lambeth.
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  #18  
Old 11 Aug 2007
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Running again

Hi.

Oh yess. it´s up and running again

Yesterday I took the engine out and went over the whole thing again, harness, connections etc...etc..... I could not find anything wrong.
Since my old engine is still laying around I decided to put it in and see what happens. Same thing as the new one. Crank, Sparks, fire´s and dies.

So there must be something in the electrical system after all. Again out with the wireing diagram and go trugh the system,can´t figure out what is wrong. How ever now when I have the 1vj and are useing the kickstarter to turn it, it feels like the timeing is off. But that is impossible everything is as it shuld be, so now I start to suspect the CDI.
Problem is I don´t have spare one,and Tenere part´s are hard to come by here. One of the guys at work is driveing an XT250 so I give him a call,maybe he knows were to find one.

Sure no problem, 10min later he shows up together with a guy on the most beat up 34l I have ever seen and he has a CDI for my bike.
We connect it and try, still the same......
The guy with the 34l takes one look at the wire loom comming up from the alternator/pickup and eagerly starts to explain something in swahili,after a while I understand that he want´s me to put the the pickup wires the other way around(mirror whise to the wire diagram ) Well what the heck.....

The bike starts on the first turn and runs smoothly!! I can not belive it!
So now the engine is runing perfectly, but the color codes are screwed up, I have no idea how this can be. What I can understand from the guy that this has happend to him as well,maybe these are some aftermarket units? It must have been connected like this before,but I followed the wire diagram when I connected the system and got it mixed up because I followed the color codes.

Anyway Im very pleased that it´s going again

Thank´s for the advices all of you that has posted in this tread.

Im off to find some trails
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  #19  
Old 13 Aug 2007
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Like a new bike

After a day rideing TX with the new engine I have to say that Im really pleased. It´s like a new bike

It pulls smoothly without hesitation and the vibrations from the engine are nothing compared to the rattle and shake of the old one.

Next on the list is to fabricate a new rack for the panniers, and an upgrade of the rear suspension.

Tom.
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