I know these bikes arent ATV's .. but you guys know a lot. I found a 400 maxim (86) for likr 400 bucks (canadian)... she runs and stuff. so she's not the issue really. I also found what im told is a 440 maxim (havent seen it yet) for 75 bucks. .the guy said the head is split. Im kinda curious as to how difficult this head might be to find second-hand (scrapyards and the like), and if hte pipes of the 440 are able to be used on the 400, because i know the pipes arent great on the 400. Im really just lookin for a bike to bang around, and wondrein what the chances of me bein able to get two bikes runnin are? thanks guys..