Re: AFR tuning
I would not lean it out - I'd be very comfortable with those numbers. Keep in mind that your AFRs spiked on full throttle, so you might want to check your accelerator pump settings - is the "push rod" on the outer ball in the lower linkage - the 'W'inter setting? If so, then you're getting the max travel and squirt. Next, you might change the power/enrichment valve to richen it up a little bit (More volume earlier in the cycle). I'd move it one step smaller - then retest. Would be nice to try to reduce the lean spike on the initial acceleration hit.
Important Note: Power Valves use engineer’s number drill sizes, so a smaller valve has a higher number.
Also, you should experiment with your timing - as 27 degrees might not be the magic number. I would move it down to 22, do some more tests and then move it two degrees up to 24, then 26. I run a max of 24 degrees on most of my engines.
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