I just stick with PAL images but u should check with gbatemp or psx-scene to make sure the game won't brick your wii first before running, they also have a comparable list as to what NTSC games will work on a PAL machine, PAL is what we use in the UK for those who don't know.
gbatemp
GBAtemp Forum (Powered by Invision Power Board)
psc-scene
PSX/PS2/PS3/Wii Scene & Newz Forums - Powered by vBulletin
I also had to reprogram my chip with YAOSM for Super Mario Galaxy to work, check to see if the chip u have can run the game on the above sites as there is a risk of bricking the wii otherwise.
YAOSM can be found here, I used this instead of wiifree on a 12F629.
yaosm smg beta testing and nothing else please. (It's WORKING!) - PSX/PS2/PS3/Wii Scene & Newz Forums