426ex? i was going to go with the 155 main anyways hehe because i plan on doing alot more mod
but my main ? is did you change your pilot jet also i have ak around alot of dealer here in ohioe and they all tell me the same thing dont het at all. I know that cant be right my 400 has to be jetted it running lean sense i put the pipe and K&N on i seem to be losing more power then gaining it as it is right now........the 155 main jet going in today when i get out of bed before i goto honda hills

 

with just the pipe and k/n kit no you do not have to change the pilot.

 

did'nt know any thing about it being lean from the factory.

 

Hey guys all i ended up doing is raising the needle i notch. It's not running lean anymore. Its now rich. Plug is dark grey but not black. I guess that will have to do until july. Hey listen to this, i call jerry ferrell today and asked them since they are a bigger shop. They told me they couldn't legally discuss it. Isn't that a load.