My friend has a stock 2000 400ex that he just ordered a Trinty full exhaust and adapter so he can take off the airbox and run a K&N. We are around 1500-2500 feet. What jetting do you think he needs to run?

Thanks alot for any and all information.

Street

 

Best thing to do would be to contact the manufacturer and see what they reccomend.

 

you will be prol close but you should call Randy at Trinity to make usre though......Tina