Been fighting this issue awhile now. The ground strap is melting off spark plugs.
Thought it was lean, put in richer jets/ needles and plug is dark chocolate. No grey specs
205 psi compression. Running Sunoco 110 with 927 at 40:1
Put in all new 2001 cr ignition
Switched to a colder B9 plug
I thought the ignition swap fixed it. But this past weekend, after 5-6 tanks of gas, quad wouldn’t start. Pulled plug and found this.