carb air flow technical question

[Agemax]

ok i still have the 138's. may give them a go, when i refit the pods. midrange power is good with no flat spots so im leaving the needles as they are, middle position.
plugs do look slightly dark on a plug chop but i wouldnt risk running it to lean. i will do a plug chop with the 138's and see what it looks like

[KEITH KRAUSE]

ok i still have the 138's. may give them a go, when i refit the pods. midrange power is good with no flat spots so im leaving the needles as they are, middle position.
plugs do look slightly dark on a plug chop but i wouldnt risk running it to lean. i will do a plug chop with the 138's and see what it looks like

OK Just thought I'd pass that on about the mains. The 142 was pretty close but that bog was obvious overlap caused by the 142 since I was positive the jet needles were good. My bike wasn't the only one to show that effect.
As for the jet needles, with 6 positions there is no "middle" position. I've jetted quite a few 1000's with similar mod's, some myself and many others over the web. Every bike ran best with the e-clip in the 4th position from the top. ONE owner at this site said position "3 1/2" (e-clip in 4th position with jetting spacer directly on top the clip) seemed to work best for him but I can only go on what he claims. So if your dark plug reads are related to position 3 or 4 I'm surprised. If those dark reads are related to the main then I'm not surprised.
I've found literally no variation that you typically read about when jetting when it comes to the jet needle position. By the way, DJ has some good kits but their recommendations (baseline settings) are ridiculous when it comes to the jet needle adjustment. If the bike is in good tune and no compression/wear issues then the final jetting is very consistant.
So if you do happen to be using the 3rd position from the top then I believe the bike is very lean while in the 1/5 to 3/4 throttle range. Since you spend the most time riding on the jet needle circuit with a small overlap from the pilot circuit, it's really important to get that spot on. With todays fuels it's a little harder to get a good color read on the plugs when chopping off at 1/3 to 1/2 throttle but ride it at that position a good couple of miles should help, even if you have to do it in shorter runs to get that accumulation. I've sometimes had to run it about 1/2 mile a few times back to back to back to get what I believe is a good read. Just run it, pull in the clutch and quickly as possible turn around and go again. Takes a safe area though to do the testing. No downhill roads. Just level or even uphill is good. Personally, I've always been able to "feel" a lean condition maybe a little easier than some. Hold that throttle still and I could feel the surging on the jet needle with the needle in position 3. Fairly white plugs too. Position 4 typically gives a more consistant graying with a small amount of tanning, sometimes just grayish. I found richening to the 5th position gives way too rich readings everytime and position 4 1/2 still on the rich side.
Be sure the carbs are synched well first and the advance timing spot on. Too easy to get un-uniform colors if not closely synched. Which plug do you believe?
Take a piece of hosing with you when you test so you can more easily remove hot plugs. Helps thread them out the last few turns without dropping them and to start them too. Just be careful of cross-threading when re-installing if you use a hose. Might take a few times to get the "feel" of it. Sorry if you don't need any tips. Just my habit.

[KEITH KRAUSE]

By the way, my jet needle recommendations above assume all the factory nylon jet needle spacers are there and assembled in correct order. Larger "ring" on top the e-clip, thinner spacer under the clip. Any jet kit jetting spacer goes between the e-clip and ring. You'd be surprised how many owners find out their carbs are missing parts or parts are reversed. The ring and spacer in this case will greatly effect the jetting if not correct.
Anytime I think a chosen jetting could be a little off the norm I mention this.