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Thanks for the reply. First Id say if you are determining xs400 hp based on xs360 dyno, obviously you have to keep in mind 38 hp is quoted at the crank! So you can't really add like that. Also, those calculators are for flywheel and not dyno hp. I just want an estimate of what the bike is...

Currently my 81 xs400 Special is in the shop. It seems like it might need substantial repairs, possibly a top-end rebuild. The mechanic was talking down how much I'd want to invest in it, saying, "You know, it's an old bike, small engine, people don't really want those, you wouldn't want to...