K&N and Foam

[ST87]

Would i have to rejet to swap back forth from a K&N filter to foam filter.

[bwamos]

Depends.

Airbox lid on (and unpunched), you'd probably be ok.. but with the airbox lid removed, you'd most likley need a main 1-2 sizes larger for the K&N.

If you're running 13:1 on the foam... the K&N shouldnt be too lean.. but why switch if your not gonna add more fuel?

[ST87]

Maybe i shoulda given you the whole scenario i have it jetted for a slip-on fmf powercore4 shorty kandn filter and no airbox lid and i wanna switch back to foam every now and then.

[bwamos]

Yea, you'll need to swap out the main, most likley. The rest should be fine.

Jet it for the K&N, then jet it for the foam and just swap the main when you swap the filters.

Honestly, if you want the extra protection of the foam filter, just get a UNI and be done with it. ;) The K&N flows a bit better, but not enough to make swapping the filters and jets worthwhile. ;)