sparks recommended jetting??

[cals400ex]

i have called sparks numerous times about jetting. they told me that a white plug doesn't mean it lean. a 4-stroke will be totally different from a 2-stroke. he said they call for a smaller mainjet than anyone else but its weird because theirs makes more power and seems to last longer. he was saying that for my 11 compression 406, stage 2 cam, x-6 pipe, airbox lid ON, etc. to use a 150 main jet. this is for 80 degree temp and sea level elevation. with the lid off he says a 155 would be good. does anyone agree with this jetting?? i run between a 158 and 162 depending on temp. by the way, he said my cam and piston will barely change the jetting. for example, he said that i should stay with the stock main if i just had the pipe but go with the 150 since i have the cam/piston.

[300exOH]

Their jetting seems pretty close for me. I have a stock motor though. From what I understand a white plug means lean but I could be wrong. I would double check with a new plug and go from there. If it's still white I'd go up a size or two on the main.

[BKVIEW4U]

if you are running dynojets i would'nt run less than a 160 if it was me. my friend has sparks big cam and x6 and he runs a 165

[cals400ex]

i use keihin jets. i don't know the difference between the numbers either. however, i do know that they are not the same.