i have a 2003 crf 450 with 13 1/2 to 1 cp piston stage 2 hot cam mild head mod a big gun slip on stock head pipe the slip on was about 19 inch. long but i modified it its now about 10 inch. was boging up hill and would not idle at a low idle so i had it set high . i found out the flout valve on my slide was upside down. that fixed the idle problem .i had it jeted realy high because it was lean i think that it was becase of the slide . So the jets were, main 180 clip 5th pilot 158 air screw 1 3/4 . after fixing my slide it was way to rich so now it is, main 178 clip 5th pilot 148 air screw 1 1/2. now it runs great but is hard to get started also is kind of easy to kick what should the decomp be set at ? and do you know were i should start as far as trying to get started easier.