here is whats up...
i have a 97 400 xplorer 2 stoke and it blew up (big suprpise) anyway i found a fresh rebuilt engine out of a 94-97 scrambler, i notice the reed cage is a bit different (it has a tee handle on it) dont know what that for???
now my can is stock but a plugged the down spout and welded a stump on the end of the can
the temp. here is about 26-32 deg

i always ran a 220 main jet in the winter and 200-210 in the summer,

i notice it flat spotting or (leaning out) at wot this was with the 220 in it and it smoked
now i put a 230 then a 240 jet and it seems to smoke less...

i ran about 1/4 mile and it started to lean out again...the plug is real light brown...
any sugestions... is it air or gas related,

i have k\n filter, & down spout cut in the air box....

if i put a temp guage in the pipe what temp should it run??

thank you very much in advance...

steve

 

i have a 96 400 explorer with 950 miles on it when and why did it blow i havent had any problems except the clutch cover warp

 

i would bump it up one more size