[Z400JER]

Is there a need to rejet the carb. if I install a K&N filter w/ adapter or can that wait until I get a pipe? Thanks.....

 

[honda killer]

You dont have to rejet with just a k&n as long as you leave the lid on.

 

[Barely Legal]

Right. If you pull the snorkle or the lid you will need about a .146.

 

[PrEtEnDeR]

Altitude has alot to do with it as well though. Myne is piped/headed and K&N and its stock jet and still running rich here at 6000 feet altitude. I'm going to drill a few smal holes to lean it out a little soon.