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jetting ? backfiring and popping
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Posted by: jetboy_05

i have a 04 yfz450 proflow intake with k&n, w/o box lid, and i

have a revbox, also i live in utah about 5000ft above sea level,

my jeting is 160 main 48 pilot fourth on clip and about 1 1/4 turns

out on fuel screw. my problem is when its in neutrel. i rev it

up, about three times and it pops when the motor goes back to

idle , and a flame shoots out of the stock pipe. the flame would

tell me its to rich, or can it do that if its to lean does anyone have

any suggestions

Posted by: gotwarrior

Why don't you put a new spark plug in it, and check and see if its rich or lean.. (I would say it rich)

Posted by: jetboy_05

if its running rich what do you suggest i richin up?

Posted by: 04450rrider

If it is running rich u would obviously lean it down. Try a jet size or two and check ur plug.