Hey everyone. I use the search, but didn't find what I need. Running 260 mains, stock pilots, 3 clip. FMF Gnarly/Powercore 2s. I put the exhaust on and jetted it as stated. The quad ran great. I rode it 5 times totally approx 10-12 hours. In the middle of the last ride, it started popping. Now it pops, it jerks when riding it, and runs like crap. Hard to start. I changed the plugs. No help.
Did a plug chop today, looked like a slate gray color.
I understand that it is running lean, but any idea what is causing it? No real change in atmospheric conditions since I jetted it. Choke tube is in place.
Any help trouble shooting this would be greatly appreciated.