450r carb jetting

[QUADSQUAD7]

I know there are mile long threads about this and read them all.
This is what I have and any help would be appreciated.
2002 400ex:
stock bore
stock piston
stock cam
Ported and polished
full system custom exhaust
450r carb


a starting point on the jetting would be great. Thanks.

[leasureryan]

you won't be much above the jet sizes on your original carb. If you previously had a 168 main, I would start at a 180. If you had a 42 pilot, I would start at 48 pilot. Thats was a great stating point for me. I started at 190 and came down to 180 after 3 dyno pulls. Anything more than 180 was causing power loss for me, 180 pulled straight through, but still seems a little rich for me. I am going down to a 178, maybe 175. 48 pilot works great for me too