Plug Pics, Good or too lean? Options

[pbanders]

What's your take? Approximately 2500 miles on these plugs. Car is running great, good power, good economy, doesn't seem like it's getting too hot. CO is set to 2.5% at part load. From what I can see, they look good but on the lean side. Top row is cyl 1, 2, bottom row is 3, 4. Ignition is a Crane XR3000 with a Crane PS60 coil.

I'm inclined to leave it as it is.

[pbanders]

Oh, I almost forgot. A shout out of "thanks!" to Chris Foley at Tangerine Racing, for the great "MPS Tuning Kit" and stop screw (full load stop). I'd bought a full kit from him some time ago, including the diaphragm, but as I've had good MPS's since then, haven't done a rebuild. But tonight, when I was doing the adjustments, I used the "tuning kit" which was really awesome!

The problem the kit solves is that you first adjust the inner main mixture screw at 15" and 10" of vacuum, then from 5" to 2", you adjust the outer screw to get the transition to full load correct. Problem is that when you turn the outer screw, the inner screw turns, too, and you mess up your initial main mixture adjustment. Enter Chris's kit, which has a tubular wrench to adjust the outer screw, which allows you to run a screwdriver inside of it to hold the inner screw stable. Works like a charm!

I also appreciated the drilled-out full-load stop, which has been milled for an 8 mm hex key for adjustment. This setup allows you do all three adjustments without leaving the diaphragm unconstrained by the full-load stop. Plus, it has a nice vinyl cap to keep out the dust. Way better than what Bosch ever envisioned! Thanks again!

http://www.tangerineracing.com/mpsdiaphragm.htm