Awesome. Can't wait to see more
I have an air cooled 84 CR500 and it was a "ping king" like most of the YZ490's. I like the Eric Gorr head mod but the biggest game changer for me was the 39.5mm Keihin PWK and a lot of fine tuning with different needles. I have not had it in the dunes yet but as far as trail riding it has not pinged since. I can't recommend that carb enough if you can find one for a decent price jump on it.