A forum for owners of Yamaha TTR250 trail and enduro bikes!

Elijah Bronson · Member

CDi questions and answers!

ttboof · Super Guru

Elijah Bronson wrote:
Right about exactly the same for me. I can't verify yet that mine works, but by Brian's indication, it should be just fine. I ordered a CDI and it should be here Thursday.

before it arrives just double check the wiring and switches for any places it may have rubbed through to the frame or together .

will be good to hear how you go .

I have had a CDI fail on an XT550 a long time ago they had a problem with a poor connection in the unit (recall ) , I broke down about 4 hours into the bush i bolted the seat down with a stick jammed down on the top of the cdi and got home , i have feeling its not the case in the TTR its more a component failure and are rare .

Elijah Bronson · Member

Well guys thank you so much. You've been loads of help!! I took her out for my first spin in the mud yesterday and it is just a blast to ride. Thank you for all your insight and assistance guys, I wasn't sure I'd ever get to ride it some days. My biggest problem was I bought a cheap stator from ebay, big mistake. I then got a refund because I determined it was faulty, cause it read only that .05 volt on both AC and DC. After I put in an RMStator, it fired right up. When I get home I'll post here a 15% off coupon they sent me, cause I found a coupon just like that that saved me $23. I also needed a CDI cause no power was being sent to the coil so I knew it was bad. Here are the rough values as I recall them:
With bad CDI: orange wire, key on, no cranking: 0v. Cranking: 0v.
Good CDI: orange wire, key on but not cranking: 60v DC. Cranking, nearly 200 DCV.
Good pickup coil: 200 ohms, .5 ACV while cranking.
Hope this will help someone in the future.
If you don't mind, I'll copy this over to my own thread to finish it out. Thanks again!!!!