The dealer has told me that if I put the new pipe and filter on I would not need to rejet. This sound like a bunch of BS!!! Sould I ride it and check the plug and go from there? Has anyone else done the following mods and not rejetted? I have a 2001 Warrior and the filter is ProDesign intake system and the Powercore IV FMF pipe. If I do rejet I was thinking of starting with a 150 main jet does this sound right? Do you think the pilot or needle will need adjustment? Thanks for any help you can give me!!!!!!

 

figure it this way, you added a less restricted air filter and exhaust system which allows your engine to take more air in (which leans it out) and lets more out which also creates a demand for more fuel. I'd take the main up 2 sizes, ride it, read the plug and go from there.
Good Luck!