ok... so as some of you know i rebuilt my 400 this summer and pot the wiseco 87mm, 416 kit.... stock carb (first start was with 60 pilot, 2 turns out, and 160 main, 3000') and went from a xrs only header and exhaust back to stockers with gordon mods 4 holes b/c xrs only header was cracked. snorkel removed, uni filter, i put in the same old stock cam, new crf chain, tusk heavy duty clutch, kw valves and springs, and an iridium plug, maxima 20-50 the thing purrs... runs nice and smooth... starts easily (almost too easily.... thought i didn't have any compression today, but it started right up)... i let it warm up and cool twice one day before taking it for a 10-15 mile low-mid rpm cruise the next day... another day rode it about 30 miles, mid+ rpms... all seemed good... thought temp was "normal" or didn't notice anything... usually runs 200+/-... checked valves... possibly set them slightly tighter than normal... but could still drag the feeler guage out.... changed the oil to Napa 20-50... next day i went out and worked it up into higher rpms, WOT a few times, road turned kinda sandy still fifth gear... looked at temp about 20 miles in to the day and it was on 250, teetering over.... mellowed out and went home, pulled plug and it was bright white... lean, right? seems to be 60 is the fattest pilot for the stocker and i ordered all the higher mains... a 162, and 165... put the 162 in this evening and temp reached 240-245 after 5 or 10 miles of 5th gear riding, mid+ rpm... no stumble WOT... get home... white plug... put the 165 in and similar temps... settles in around 240... can barely feel a stumble WOT... plug still bright white, might barely see some gray, not brown though... going to try the maxima oil again... what about the iridium plug? what about no fatter jets and still a white plug? what happens when you are too lean on the break in?