I just recently purchased a complete White Bros E series exhaust system for my 400ex, and also a xr250 CDI unit. I currently run a stock air box, and stock carb jet settings. I ride in the desert so what should I change my the jet in my carb to?

IF I plan on going with a K&N ATV Powerkit, should I use the jets that they provide or should I go for a buy a larger jet?

Thanks,

Joe

 

I am running a k&n filter, e-series pipe w/18 disks and a wb rev kit. I run a 163 jet and kept my main stock. I raised the needle one step. It go's like hell on a hillclimb to the big gun with all the same setup. Run with the airbox cover off and an outerwear. Make sure you watch your k&n for sand penetration and keep it oiled. Also, be sure to check your throttle linkage for play, Honda under adjusted them on the 2000 models.

 

Is your engine stock?