running lean questions

[rawfamily]

i just took out my spark plugs wires to see how my sr is running, and they looked light tan color. After searching i think i am running lean. but no runing problems. idle good, no white or smoke out the exhaust. what do u experienced sr drivers think.
mods are:
Blacktop
walbro fuel pump
z32 fuel filter
greddy FMIC
sr maf