Air/ fuel tuning

thanks for all the replys.
probably wont have the car back out for a few days.
ive chaned the powervalve to a 6.5 as that sounded like the easiest thing to try first.

im assuming here because the lean spike is from a high speed cruise , you dont get a full pump shot and therefore more relying on the powervalve to enrich the quick change ???

also you said the powervalve restrictions? is this related to the amount of extra fuel the powervalve allows through?


if after the initial spike drops down the air/fuel drops to the 12.5 , possibly was even 12.2
ill have to bring some paper or a cam to get these records as i go.
would a drop in the secondaries be a good idea?

its just that would bring it from
dyno: 82/86
to 76/84
is that way too much , dont want any lean issues.

and yes i do enjoy trialling things back and forth especially if i got a bit of an idea of whats going on , but just want to know the limits of lean mixture before i do damage