92 yamaha warrior 350 running great one minute then quits,checked spark & with starter button depressed nothing but when start button is released I get a healthy blue spark? I am at a loss here &with my SSI as my only source of income the whole wallet fueled guessing game isnt an option so im hoping someone may know the exact culprit here,thanks for all the advice...

 

I had a Warrior that did something similar to me one time, turned out it was a wire that had rubbed the frame in the rear until the bare copper was touching the frame sometimes. Yamaha looped the wire harness over the frame under the left rear fender and pulled the wires tight - perfect disaster waiting to happen.