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Post Info TOPIC: Electrical help/measurements


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Posts: 1
Electrical help/measurements

Hello just joined the forum, used the search function to no real help.

Purchased a 1999 USDM 250 a couple weeks back. I had a 225 and loved it, so I was hoping to jump to its bigger version. Needs maintenance which i've been going through. Bought it with a mid throttle breakup, figured carb no big deal.

Rode it this weekend to try and get it ready for a real trail ride and it died electrically, no lights, no power whatsoever. Sometimes it would rev fine, sometimes it would breakup previous to this.

Pulled it apart. Noticed it had a Ebay $70 CDI Box and the Main 15a fuse melted completely.

Put a new fuse holder and fuse in, key'd on, CDI box gurgled at me, took a second and blew the fuse again.

Replaced the fuse, unplugged the CDI, and key'd on, no blown fuse. Bike cranked over (obviously no start with no CDI).

Does not seem common to lose a CDI box, I am curious what everyone's AC measurements (resistance etc) are if someone could take them for me as the bikes currently inop. I dont want to pay $350 for a new CDI box and for something to immediately fry it.


Super Guru

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Posts: 8568

Hi Gavin

I have only just seen your post.

The Yamaha workshop manual for the TTR is very good and will probably provide all the information you need.

Also, there may be some useful inormation on this thread.

If you haven't already got one then you can buy a download from Steve at Totally TTRs if you click here 

Good luck and let us know how you get on!



Exeter, Devon, UK

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