Check out 250 ninja forums You should be able to find some help there.
Carlos <moreirc@...> wrote:
Hey,
I have a 1990 EX250 with about 17,000 miles on it.
It won't keep running. I removed the carb and cleaned it.
I had found it was separated from the air box but after cleaning and making sure it was
correctly fitted to the air box it still will not run.
It start if the choke is all and runs. If the throttle is opened it stalls.
if the choke is turned down it stalls.
Could this be spark related? Where can I buy new coils?
Best Regards,
Carlos