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inxs- yeah that's what I thought too. I would've thought this would be an easy process considering that on the frame it says 250/400 hence it being bigger than most 250s. and aswell the hole for the piston in the crankcase fits the 400 piston. So it all seems interchangable EXCEPT the conrod...

oh any advice to what I am doing would be appreciated. Cheers

Right hey guys. Let me start off by saying this is my first bike. I am a amateur. I have picked up and old 1983 xs special. It came with a 250 and 400 spare including whole engine. I am replacing the top half, cylinders etc with the 400 and so far I have run into some problems. (By the my...