Got a couple more race days on both of mine and they seem to be getting better with each run. The Trinity fuel works good with the motors, but any good quality fuel probably should. Went two race days with out changing the plugs and temps were around 208 to 220 most of the time. Seems like a big swing in temps, but that was over the race day and I didn't change a thing on the carb. Didn't really think I needed to as they were running good and didn't seem to be lacking anywhere on the track. Morning air temp was around 65 and high for the day was 98 with 85% humidity.