What year is your Grizzly?
If you are still having trouble try these things as well. Pull the plug boot off of the coil wire, make sure there is good clean wire at the end, if not, then clip a little bit of insulation off, about 1/8th inch at a time until you find good fresh wire. Next, check the pulsar coil, take a multimeter, set it to ohms, and test across the leads, you should get a reading somewhere in the neighborhood of 500 ohms. Also, is this coil you are using off of the same type of quad, or is it off of a different kind of machine?
Yours truly, sincerelly, love always, Josh aka The DirtDemon.