I may be right or I may be wrong but this should be (according to those in the know) Daniel Larusso's bike in the original Karate Kid movie. A Mongoose apparently. Of course, I'm open to correction.
If correct how much do these bikes sell for now. Presumably retro as Karate Kid was made in the eighties.
The said bike got thrown down a bank when the Kobra Kai bikers rode past on scramblers but was repaired by the maintenance man (Pat Morita).