I have tried several times to apply Patch in the original game and had the following errors:

WBFS format: When I choose to create the game in WBFS the WBFS file is not created.

ISO: In this format it can create an ISO, but the selection of tracks is broken, you can only choose the tracks of the WII.

CISO: Same as ISO.

No error message appears, when I try to make the file in WBFS the "new-image" folder does not appear.

When I choose ISO (or CISO) the ISO file is created successfully, but the problem appears in the selection of stages, the icons are bugged and it is impossible to change the page to choose the CT's.

Some of my friends tried and the same thing happened.

Anyway, I just want to alert, it might be that the next Mario Kart Fun patch will come up with problems.

Now it worked. Before I was using an MKWii ISO with the old Wiimmfi patch, now I applied the patch using the clean ISO of the game (without patch).

I'm playing without problems. Thanks.