XS400 rear end change

[SEAN HUNTER]

I have an XS400SE, with a 16" rear drum mag wheel, and want to convert to a 18" rear drum brake wheel, but struggling to source one.
My question is, has anyone tried changing the swingarm from an XS250, with rear disc etc, as its an 18" wheel.
Any advice would be welcome.

 

[festasextremis]

Which years? Year model seems to mean a lot with these. I wouldn't have thought the problem was wether or not straight swaps would be a problem, more, the problems beginning with where the pivots for the suspension are, and if you are taking suspension from a single shock bike or not...

And then there is the brake pivot for the foot lever, and the reservoir and master cylinder mountings. It's not a big deal, it should all be easy brakes making work, but i wonder if there aren't tabs on the frame for things to bolt onto.

I would hazard a guess that even the stock 18" wheel and tyre could just go straight into the rear axle, and with a 340mm shock upgrade be enough, have yiu tried mocking that up?