what about dropping it to 14 where it is now 15, and just acknowledge the rest. I would assume backing off the thottle as more air gets in to drop it to 14 would require a bigger air inlet. That reading is very high, the 21.
I have a 1781cc carbed that does not go that high, injection has delyed cams for the computer to compute. I almost want to install a guage for the heck of it.
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