jetting help!!!

[ridered03]

heres the deal; last year I had my 450 jetted about perfect then in between seasons it sat for a while now when I ride it it pops and backfires real bad when I let off after hard acceleration.

what is the cause I think it is the jetting, is it too rich, too lean? I looked at the plug and it looked fine. some one please help.

[jeepnrocks]

i think you may be to lean on the pilot. if you richen your fuel screw it may help but you may need a larger pilot (50)

[911]

what he said:D

[houdy450ex]

Check your headpipe bolts

[ridered03]

ok thanks guys