fit

I bought a 79cc harbor freight predator engine despite my Dad's warnings that it would never fit in my frame, he was wrong, but only by 3 millimeters (actual figure, I measured)... here's some pics... http://imgur.com/a/MguAc

I have tried zip ties but on the chain guard where the hole is, it is too far back behind the frame where I am supposed to tie it down. I can upload pictures if needed... What should I do to try and fix this? Or are there any other chain guard alternatives? I want to be safe, I have been riding...