I probably confused you in that previous post referring to a 4GB CF card, your Navi maybe still can't see a map image even if it's the under the 'FAT16 file size limit' of less than 2 GiB on a 4 GB card re-formatted to FAT16, but it certainly can't see an image 2GiB or over on a card formatted FAT32 which is what you tried, 'cos it cannot see that big an image file even if it can recognise the FAT 32 format [the related SP 2610 can't].

Therefore, simplest way to test would be to just use a 2GB or less card formatted in default FAT16. The image is then restrained to no more that 1.9 GiB [~2,047,541,000 bytes] which is well under the limit of 2,147,483,647 bytes anyway. So you will need a gmap folder of any NA NT map and your original locked non-NT image which came with the bike, That's probably either 2005 or 2006 NT North America. If you have a later non-NT up to 2009 you can use that as long as it's an official locked image purchased on a card.

So in MapInstall, from the NT gmap folder generate a small image where you are in MB. Even a single tile will do. Send it to any usb stick or media card, then copy the img to your PC. Unlock if necessary with gimgunlock, then combine it and the locked non-NT image using GMAPTool to create a single gmapsupp.img to try on a 2GB CF in your Navi.
Deselect the non-NT before testing the search function.