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I've always liked those Honda's from that era and had a 900 in the eighties.Doesn't look bad from the photo. First thing youd need to look at is getting a chain on the sprockets to see what you have in the way of alignment. They used pretty skinny tires originally, and the gearbox sprocket could be too far in to clear the wider rear tire and rim. If you clear that then you at least have an easier path with less fundamental stuff.What style bias are you considering?
The first challenge is to get the rear wheel perfectly centred. If it's not dead in line, you will have all sorts of issues!Then you can drop a chain on and see how the alignment will work. Or not It is possible to machine the sprocket carrier down some to bring it in, and you may be able to buy or have made a front sprocket with more offset to get it to line up. Tyre clearance will limit you, as will the frame clearance and front sprocket cover. When you have all that done, getting spacers turned to fit us the easy bit!That all sounds promising! Thanks for the update! AlI have seen some fairly chunky back wheels fitted to these, so Google a few 'Spencer Replicas' for 750/900 fitted with alternative running gear and see what size rear tyres/rims they have. I reckon you should be ok with this rear end but it will take a bit of fiddling