From Longman Dictionary of Contemporary Englishldoce_227_emotorbikemo‧tor‧bike /ˈməʊtəbaɪk $ ˈmoʊtər-/ noun [countable] 
especially British EnglishTTC a small fast two-wheeled vehicle with an engine SYN motorcycle
especially British EnglishTTC a small fast two-wheeled vehicle with an engine SYN motorcycleExamples from the Corpus
motorbike• Luckily, as they returned to Cockroach, Wednesday's dormitory, they bumped into Matron who was fixing her motorbike.• Jimmy, dressed in jeans and a black leather jacket, had arrived on his motorbike.• A woodcock sounded in the near distance, like some one trying to kick-start an old motorbike.• The yard was empty except for a neat looking two-horse box and at the far end a large powerful motorbike.• Yesterday we had one working motorbike, and tomorrow we will have one working motorbike. 