Jetting Help

[Oregon dunner]

I am having some jetting issues and I think I am getting real close on where I need to but have a few questions and looking for some suggestion to try for the next time I go out.

My Current Mods. 4 Mill 421. CPI in frames. I have a aggressive port job on my cub cylinders by Kevin at HJR. 19 cc domes and + 7 timing. I am running 35 pwk carbs and my current jetting after today is 52 Pilot, Cel needle on 5th clip from the bottom. My needle is all the way down. I have a 160 main. The elevation is at sea level. I have only a couple hrs on this motor. I started my day off with a 52 pilot. The needle was 4th clip position and a 160 main. I had a bawg down low and did not know if it was a lean or rich so I did a plug chop with 2 wfo runs. I put different plugs in and continued to ride and try different settings. I felt like topend was good and maybe could go to a 162 main. I started to mess with the needles and I raised it up a few clips and 1.5 turns on the air screw. The bog got worse. I went back and dropped the needle all the way down. 1.3/4 turns on the air screw. I raced it thur all the gears and the bike felt real good thur all gears. I feel like I could go leaner down low but I feel like I should not have the needle all the way down. Is this because my pilot setting is to rich or maybe even my main? or do I need a leaner needle? The bike flat out rips and has power everywhere and pulls really hard and long up top.

I came home and cut the plug apart and I had a light brown color on the base. I am thinking I am real close but not sure. Any suggestions?

Thanks

Edited July 5, 2012 by Oregon dunner

[Oregon dunner]

here are some pictures of my plug chops . Looks real rich to me

[registered user]

looks fine to me. you notice if there was a burn mark at the bend of the strap ?