I have a 2004 Raptor 50. I just got the Raptor 80 carb kit to do the mods everyone suggests. I installed a new ProCom PE-C-AY50 CDI box too and modified the slider and throttle restriction.
I couldn't figure out how to remove the NOZZLE, so I left the original in there. Is the 80 nozzle any different than the 50? (it may be clogged from bad previous owner) The quad spits and sputters and runs like sh*****. I turned the air screw a few different ways etc. I can get it to rev fine just sitting there "Sometimes". But in gear, forget it. Sounds terrible and embarrassing. . I don't have an air filter yet (FYI). The guy I bought it from didn't have it.
I was thinking maybe it really needs the new nozzle but I don't know how to remove it. And I was VERY careful to keep things clean as I put in all the new parts. I had a little gas filter on the line but I think i'm going to remove that in case that is restricting gas flow and now I have a brand new petcock with the screen filters.

HELP Please !!