The 1975 upto mid 80's Yammy XS650 twin make a great donor bike. They're reasonably cheap and there is plenty available with good parts availablity.
(NOTE; excludes XS1, XS2 and some TX models which have different engine mounts and forks)
They have that cool parallel twin look giving them a cult following.
We've made quite a few chassis for these so if you want a frame or a full roller then look no further. Check out the links below for more info.
All our XS650 frames come with Harley style neck as standard.