I would stay away from both!!! The 80 is worth about 4 to 500 at most in perfect running condition it will cost way more to put it together. The kaw uses a nickle lined cylinder, if you bore it out you must have the cyclinder re-nickled, its costly and takes a long time to get done. I'm not a big honda guy or anything but old xr 4strokers run forever and they are pretty low priced I just sold a xr100 for 600 ran perfect. What is your budget? wha kind of riding do you plan on doin? My xr was just a beat around pop whelies n such I also have an 01 rm250 2stroke thats set up for mx track riding I'd let it go for 1200.