Biggest main jet in your 350X....

[SmokinX]

Just did a plug chop today for the main a couple times and it was as white as new with a little grayish/yellowish soot on bottom (outside) of electrode. I'm running a UNI with a 450r pipe with 2" HRC tip. I have a 142 main in now. After reading 350x posts for the last few years I can't recall anybody running any bigger than a 142. I'll pick up a 145 next time I get to town but wondering what you other X'ers are running for mains with similar mods. Does compression ratio have an effect on jet size? I think it might have been rebuilt. I'm assuming a compression gauge would tell me if I'm runnng the stock 8.5 or a 10.5. What's should the psi be for each of these. Thanks

[pinkerchook]

I have a 140 main on my 350x. I have a DG excellerator stage 1 slip on with sparky. I also have it bored over .020 with a Wiseco 10.5:1 pop up. I am burning a light golden brown. Kind of looks like a cardboard color. Another way to richen your mixture is to raise the jet needle once notch. Good luck with the jetting.