missing yz 450

I bought an 03 yz 450 last week and it has been running great until tonight if i hold a steady rpm for a while it seems like it misses every once in while any ideas also does anyone know if you can get the yellow old school graphics for this bike

Your bike is rich where it is missing. 1/4 - 3/4 throttle is needle, drop the needle down a clip and it should be good.

Old scool graphics kits are from one industries.

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