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02 YZ ran wed. No spark today

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trying to sell my 02 YZ f had it running this weekend after sitting for three months, had it running Monday, started it again Wednesday. had a friend come to look at it today and no fire. thought maybe the carb got dirty gave it a shot of starting fluid, no fire. pulled the plug no spark at all. went to the store got a new plug, Still no spark. the thing was started Wednesday loaded in the truck brought home and put in the garage. I was so frustrated today that I had enough patience to look through all the wires and I don't see any thing that seems messed up. can anyone give me an idea where to start? literally cold started in 2 kicks eve time ive started it and now no spark AT all. really Ped me off specially when I looked like an idiot in front of my friend who wanted the bike.

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Sounds like the ground to the coil. Disconnect,clean with a wire brush or sand paper.

thank you sir I will do that. I realize this post makes me seems non-mechanically inclined. I can spin wrenches just electrical aint my thing lol. ill try the ground thing and report back either tonight or this weekend. only thing I did besides check connections was pull the kill switch incase it went bad or had a short causing it to be in "kill" mode.  

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I'm about the same as you. Just enough knowledge to be dangerous!!!!! Could be the kill switch too. I would start from the plug and work your way backward. Could the plug have a crack on the insulator? I've seen people replace stators,rectifiers,coils,ect!!! To only find out it as a bad wire or connection, take the time to thoroughly inspect and save time and money. Good luck my friend. And your not a fool cause of a mechanical failure. I had a gsxr 750 sold only to have a timing chain break the day of the sale. And yep I felt like crap but it happens to the best of us. Peace.

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My sons did this the problem was the spark plug wire where it goes into the coil was bad sometimes sometimes no spark I replaced it and no issues since

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well I pulled the coil cleaned it all put it back in still got nothing so I just ordered a used coil for 25 bucks shipped it will be here Saturday or early next week and I will check back in. I just want this damn bike outta my garage already, it does however make my 08 look awful pretty sitting next to it.


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Ok guys I'm at a loss. Got a cool pack off eBay still no spark. Disconnected the kill switch thought maybe that was bad, still no spark. Like I said electrical isn't my thing. I'm gonna look up some schematics now but I just don't know where to go. The stupid thing ran the day before I tried to sell it a few months ago and then nothing just dead flat.

So far I've got a new plug that I checke in my new bike and it sparks, disconnected the kill switch, different coil.

What else should I do? If someone could tell me how to go about trouble shooting it is greatly appreciate it before I go dumping a ton of money on a new brain and a stator for no reason.

Shoulda sold it soon as I got hurt!

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