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xt600e no start, coil question. xt600e no start, coil question.
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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.
Photo by Marc Gibaud, Clouds on Tres Cerros and Mount Fitzroy, Argentinian Patagonia

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Photo by Marc Gibaud,
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Mount Fitzroy, Argentinian Patagonia



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Old 28 Dec 2021
*Touring Ted*'s Avatar
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Quote:
Originally Posted by stillben View Post
hello again

just stopped raining so could have another go

cleaned connections of the CDI, here's the before and after

https://ibb.co/XttfdW8

https://ibb.co/G7QGVhD

ran a jump lead to the negative on the battery, cleaned the battery connections.

and tried again with new cap new plug and that new ignition coil. here's the vid...


https://youtu.be/8OiHdT2JAKA

that's the battery at fully charged. it is 4 months old but was a cheap one
You definitely have NO SPARK. Or not a spark which is worth calling a spark.

Can you beg, borrow or steal another CDI ? Have you checked continuity, or better, voltage drop, from the CDI to the coil ?

I don't have an XT600 wiring diagram in front of me to look at but my guess is the capacitor in the CDI (Capacitor discharge ignition) is toast.

I think that's why you get the small spark then nothing. The CDI is not building up enough current.

If you're keeping the bike and it's an original CDI then you should change it anyway. Or at least carry a spare. So a CDI purchase won't be a bad idea.

You could also look a the ignition pickup. Or often called a pulse generator. It's what tells the CDI 'When' to discharge into the coil to create the spark.

Have you tested the AC output from the stator too. I'm testing my memory here but I think one of the phases charges the CDI.

Basically. You need to test your entire charging system. But swapping the CDI for a known good one is an easy first thing to check.

Ted
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Old 28 Dec 2021
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Join Date: Aug 2018
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Quote:
Originally Posted by *Touring Ted* View Post
You definitely have NO SPARK. Or not a spark which is worth calling a spark.

Can you beg, borrow or steal another CDI ? Have you checked continuity, or better, voltage drop, from the CDI to the coil ?

thanks for reply.

I don't know anyone in Kent (or anywhere) with an XT with a CDI I could borrow. Don't mind buying one, though it has crossed my mind to sell this bike once or twice in the last month


I should be able to check continuity from CDI to ignition coil.

I don't have an XT600 wiring diagram in front of me to look at but my guess is the capacitor in the CDI (Capacitor discharge ignition) is toast.

I think that's why you get the small spark then nothing. The CDI is not building up enough current.

OK makes sense.



If you're keeping the bike and it's an original CDI then you should change it anyway. Or at least carry a spare. So a CDI purchase won't be a bad idea.

Which one is a good one?

You could also look a the ignition pickup. Or often called a pulse generator. It's what tells the CDI 'When' to discharge into the coil to create the spark.

Have you tested the AC output from the stator too. I'm testing my memory here but I think one of the phases charges the CDI.

Just tested for resistance. I haven't done any AC tests as I am not sure how with a system that isn't running. is this test done while cranking? I used to get 14.5 volts across the battery when it was running fine.

Basically. You need to test your entire charging system. But swapping the CDI for a known good one is an easy first thing to check.

Ted
thank you
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