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CDI unit damage symptoms? CDI unit damage symptoms?
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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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  #1  
Old 2 Nov 2004
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CDI unit damage symptoms?
HI! AGAIN! Thanx for your previous advice. I checked the spark plugs- no oil just a bit of carbon build up and the gap was a bit large. corrected it , cleaned it and it works fine .The air filter and fuel filters are just fine. I even made an air trap for the oil cooler as i thought that the temperature was affecting the Ignition unit but that didn't sort the problem out. Since last time we spoke (+- 3 days ago) misfireing got worse and now when the bike is in 4000 rpm at any gear it just looses power. I thought it was rings going but there was no oil on the spark plug. Also when i rev the bike in the neutral the exhaust smokes a lot and motor misfires badly at high revs.
I ride the bike to work out in the desert about 60km a day and soon im due home . Im worried it will get worse on my way.
Is this a symptom of the CDI unit going?
Could i have missed something?
Please help. Thanx!
dutchpopcorn@hotmail.com
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  #2  
Old 2 Nov 2004
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Missed your earlier posts.

Could be the CDI box itself - you'll need to take it to a Dealer who has testing facilities.

Could be the ignition pickup - I'm not familiar with XT's but it's probably located inside the engine to one side & sits outside the flywheel. If so, there may be a little trigger on the outside of the flywheel that triggers the spark. There should be a bunch of wires coming out of the engine (on the left?), they will be for the charging & ignition systems. Using a wiring diagram, identify the ignition wires & check for the correct resistance readings using a multimeter. Get the correxct readings from a manual. I had a similar problem on a CDI equipped DR600 years ago, fixed it this way, it needed a new pickup.

Good luck.
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  #3  
Old 2 Nov 2004
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Dont jump straight into its the CDI replace it loop. It could be something far easier. Have a look at the HT lead condition they can crack up and this manifests itself at high reves. Also test the coil though it is unlightly to be a fualt as when thy go they provide a weak spark that affects starting primarily.

Replacement CDI units are avialable in Uk from ebay. see link.
they are always available:

http://cgi.ebay.co.uk/ws/eBayISAPI.d...931615996&rd=1


I will also dig out a link from a guy here who is selling a part used one.

Charlie

[This message has been edited by braindead (edited 02 November 2004).]
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Old 2 Nov 2004
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Found it JRM still has an aftermarket CI for sale should not cost much to post and way cheaper then Yammaha.

Charlie

http://www.horizonsunlimited.com/ubb...ML/000338.html
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Old 2 Nov 2004
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Good & valid points raised by Braindead.

With a multimeter, you can also check the resistance of the coils primary & secondary windings - specs will be in the Manual.

[This message has been edited by Steve Pickford (edited 02 November 2004).]
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Old 3 Nov 2004
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Voytek,

Since you are riding 60- kms every day in the desert (off road) I'm 100% positive it is the air filter. See my reply on your other post.

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Old 3 Nov 2004
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have you already checked the diaphragm of the secondary carburetor?

It must open from the 4,000 rpm, in case that is pierced, the engine doesn't run fine in high rpm...

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