I know this comes up alot but anyway, I have a 2003 baja with k&n filter in the stck box with a pre filter,graydon race pipes and have a 180 jett that came with the pipe installed. the bike feels reel strong first through third then just takes for ever to rap out fourth and fith? I tried it with the lid on and off

please help thank you.

 

Try a smaller main. I have a 165 dyno jet main in mine and it runs well.

 

sounds like you are rich on the top end. jet down one step at a time