Interesting. I didn’t know Yamaha made a XT400 of that generation. It looks just like a XT550, maybe it is the exact same with smaller bore/stroke?
A guy on advrider has made many mods to his XT550, including suspension front and rear. Can’t remember his name, but you should be able to find him. He is very active on advrider. He probably will be able to give you some info.
My guess (like yours) is that it won’t be too hard to adapt a triple clamp /front suspension to the XT400. It will probably take some machining, but not to much.
On the other hand… your bike doesn’t have a linked rear suspension. You have a mono shock that bolts directly on the swingarm. It is possible to install a shock from somewhere, but getting the suspension to work right is another matter.
I once fitted a new front/rear suspension to a XL Honda 500S, don’t remember the year. Never got the suspension to work right…..not worth the trouble.
Maybe you should try to get some stock suspension from a XT550? Ebay?
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Yamaha XT600E '01, Honda XR400 '03, Yamaha XT550 '83
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