like mr jones touched on,,most people i observe run their engines too lean. pulling plugs and breaking plugs and disintegrating elements after 6 laps is a good sign ur lean.
HEY i thought this was a secret john brown passed to me bout 14years ago when i got 1 of them first macs. lol the # of times i had to play off the "damaged" plug.....
that pokey guy lookin over ur shoulder while ur checkn plugs n wont take his eye off u or ur stuff cause ur swinging a 1475 on ur .90 and his needs a b52--short runway rocket booster to launch with a cupped 1667 lol
"hey ! that plug's bottom coils 'r pulled WAY out ,thats no good!"
"yeah that ones trash" -put plug in pocket
"hey what ya doin stickin that push pin in ur plug?"
"yeah the coil got distorted these things r expensive ,im tryna save it"
lol
run a turn or more richer that way.
more fuel in the engine ALWAYS = more horse power.....jus gotta be able to burn it