Hey guys, I was reading all the posts and everything and first of all happy new year jeje :P
i currently have a running gs250, it gives me some problems to start it. I just have to reroute the wires from the stator. No big deal.
Any way, I just bought this bike about 2 or 3 weeks ago, it has about 1700 miles on it and it runs perfectly. The guy that sold it to me did say that he replaced the CDI, the Coil and the Rectifier. So i'm guessing that if it had a problem with it that-s how he fix it.
Another thing is that my bike doesn't have any gauges, i took them off to make a streetfighter, i don't know if that also plays a role in the intencity of the spark plug or not.
Anyway I checked my spark on my bike and it's perfectly normal.
If you want me to check anything else on my bike let me know, hopefully it will help a little bit to isolate the problems on yours

good luck !
Cyril GHISLAIN