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Change engine on a Yamaha XS 400 special to a bigger engine

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Hello, I have a Yamaha XS 400 special (1983), and I feel like the engine is a to weak... And was wondering if there are any other engines that would fit in the frame without to much modifications? Over time it has lost some power...

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just needs a refresh, no other engine will fit without major modifications


go and say Hi in the new members section 1st

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