So you are trying to get it into the air box right? It was easier for me to take the air box out. I had to take off my seat, tank, shock, and rear wheel to get the air box out. Reason for this is because it takes some force to "pop" it in. With the air box out, you can get a better visual of it and make sure the lip is properly seated. If you don't want to try that, boil some water and stick the boot in it for a few minutes. It will get real soft and then you could probably get it in. Its tough, but doable, so take your time and don't get too upset!