Just got in my new e series s bend and installed it running 12 discs and put a new k&n on and they say that i should not have to rejet the carb. Just play with the fuel/air mixture. I live in southern Oklahoma and about 600 to 700 feet above sea level. Anyone got any suggestions.

 

It makes no sence too allow more air through the engine and not provide more fuel.....I would jet up and come back down if necessary. Best too be safe than sorry. On my old 400ex, I went up a size on the main and 1 notch richer on the needle with a stock exhaust.