Sometimes an engineering failure can lead to a valuable collector’s item, which is what happened with Honda’s NR750 motorcycle from 1992. Not only is this sports bike from the ’90s one of the rarest Honda motorcycles ever made, it’s also one of the rarest motorcycles ever built in general. Honda made the NR750 as a racing bike and really wanted to push the envelope with its engine.  When motorcycle racing officials made a rule against V8 engines, Honda engineers
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