I am afraid that will be too much loader for your machine. It would take a lot of redesigning and fab work. If you are comfortable doing that level of fabrication, you might find it easier to start from scratch.
Although it appears to be in reasonably good shape I can see no reference on the Koyker website for the K1 loader. I suggest contacting them directly for information on that specific loader. They do have a few loaders recommended for tractors your size. They may even be able to provide mounting hardware specific to your tractor if the K1 loader would work.
It looks like it might fit. I found a photo of one on a Ford 1520. You better have some fab skills and good welding skills to make mounting brackets. Loader mounts are a very high stress item. It is critical to have good welds.
Here is a link to the K1 manual if interested. The weight without mounts is 600lbs. YM146 weighs 850lbs. Lift capacity to full height for the K1 is 875lbs with breakout force of 2200lbs. Seems a little big for the OP's machine IMO.
yes..a little large. thanks. I am going to look for a 4x4 with a loader. I just got this 146 with a blade and thought it would do everything I wanted. but it is a bit small and I find I would like a fel. I have a 580 case backhoe but sometimes it is to big and it dosnt do hills.