I have read that they greatly improved the frames on the 88 and up zilla compared to the 87.  Since I am very new to these machines, I was wondering if there is any way to re-enforce the frames on the 87's to be as strong or stronger than the 88 and up.  Also, does the 88 and up swing arm fit onto the 87 frame or is it a no go?  Reason I ask is because I bought an 88 parts quad and I have the option of using the swing arm on my 87.  But the frame is broken on the 88 by the LF motor mount.  It is definitely a parts quad for sure!!!  Thanks....

I really don't know what is improved, but you have a 87 and a 88 frame. What do you see thats stronger / changed when you set them next to each other? Pics would be nice