Well, what do you want to hear?? No one has input?? Maybe not TODAY, but there have been hundreds of posts on specifically the 250SX system.
Spend a few minutes with different wordings in the "search" feature but I'm not sure if that will help you. Are you looking for a place to buy a CDI or other electrical parts??
If you have the manual and can follow the diagram and use a meter your doing allot better than most people 
You can ask in the 3WW classifieds and or there is EBAY.....
The 250SX does have a weak point that I found. It gave me quite a bit of crap trying to find this intermittent issue. In my case, right at the CDI mount at the battery box I had some wire breakage and fraying because of the swingarm pivoting etc etc. You'd have to unwrap the wires' outside cover to inspect it.
Search, post again, be patient - it is what it is
All our government does is distract us while they steal from us, misspend our tax $ and ruin our country