92 fortrax 300 4x4

Folks,

I am working on a Fourtrax for my brother in law that just quit running. What I have found is in the coil I think. I get a spark when I first hit the starter. With the motor turning over full tilt, there is no spark. Let go of starter button and I will get some (not much) spark as the motor quits turning over. Is this a bad coil or something more serious?

Thanks!!

Keith