400ex Jetting

[f1prerun]

Ok, I took out the main jet out of my 99 400 ex and it was 150. I bought a 152, 155 and 158 ( i think). The quad has a wb slip on and a k&n system w/ a dynatek igintion. I just put the dynatek ignition on and it ran really lean last weekend so I swithed it back to stock; (the plug looked almost brand new after riding on it for 20 mins) Should I put the 155 in and see how that goes? It is better to be to rich than to lean right? Any ideas?

[hondarider2006]

Go and ride it and see how it does. The 155 should be good, but do a plug test. If its still white, than you know your lean. You will be better off if your a little rich. Best thing is to be dead on;)