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WR250f no spark and starter motor not working

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So I've just done a rebuild. Bearings, ring, crank etc. Got the bike back together, second kick and hear a pleasing roar. Then dead. Now I don't get spark.

I've checked all the continuity and resistance as per the manual, and come to the part where it says replace CDI. Seems a bit dramatic. I can try a friends, but hesitant until I know why mine may have gone, if it even has.

I've read as many of the forums as I can, traced the elec diagram and now have no idea.

Also, starter makes no movement or sound with a jump connected. This to me also says CDI as from what i can tell its the only part where both magneto and starter connect.

Any ideas moto wizards?

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Just tried my CDI in another bike and it seems to work fine. So must be either a coincidence that neither the magneto generates spark and the starter doesn't work, or some other mythological connection between the two I can't find....

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