[Predator_500_04]

My friend has an 03 raptor with a pro flow intake and k&n filter. The problem is the thing has no top end. My predator walks all over me. The low end is great but it just seems like it should have more on top. The gearing is stock as well as exhaust. If you stab the throttle it sometomes backfires real loud. Anyone got some hints on jetting adjustment with the pro flo installed. Any help would be great, thanks

 

[saber6]

Got me on that one! Anyone else?

 

[Airrman]

Have u tryed to call or check pro flow web site and see what jetting they suggest for your bike? If u put a pipe on there they will tell u what jets to use, Also u will tell the diff then with adding a pipe i suggest FMF factory4 is what i put on mine awsome sound.cya Airr

 

[Spun]

check the plug, is it running lean? id try bumping up the main jets one size