Went for my first long ride since installing the Amal carb conversion. I used a new plug. It ran great, but ran out of gas at about 170+ miles. I mean completely out. I expected this and had an extra gallon in my backpack. It is definitely burning more gas than before. The plug looks about right, nice dark tan instead of the VERY light tan it was before. That surprised me, with the new EFI pipe and the baffle removed and the low restriction cone filter that came with the kit, I expected it to be lean. Without the baffle, it's almost a straight pipe, you can see right through it, looks like some kind of screen in there. Sound level is acceptable at cruising speed (not as loud as many Harleys around here) and it really hammers when you open up the throttle. I wear ear plugs and a full face helmet, and don't whack the throttle wide open in town. Overall I am very pleased with this kit. I'm not really concerned about gas mileage, it's the fun factor I like, and that has definitely gotten much better.