i have no spark on a 1999 yamaha grizzly 600 and i replaced  the stater and cdi magneto and the cdi box and the ignition coil tested good and still have no spark and everything else seems to test good dont know what it could be any ideas  

hi, just wondered if you solved the problem. I have the same fault, I changed all the ignition bits inc the magneto, from my second grizzly and the bike started and ran for a few hours and then cut out, back to square one. I'd be interested to know if you got yours sorted out.