Jetted the carb for the summer heat. "04 WR450" ALT.300, temp 97,high humidity.165 main, 48 pilot,40 leak, 1.75 turns out.....Put in clean air filter. Rode the bike about 10 minutes, pulled the plug "BLACK". The bike seems to have great power in the 1/2 to wide open range. there is a definite big bog off idle. And bike is "VERY" hard to start. Have tried 160 main, and tried different turns on the screw. What do yall think????????