Japanese laws on power and speed restriction: Prior to 1993 the maximum horsepower were the following: 250cc class: 45hp 400cc class: 59 hp 750cc class: 77 hp over 750cc: not allowed The new limits for the models built in 1993 and after, were: 250cc class: 40hp 400cc class: 53 hp 750cc class: 77 hp over 750cc: allowed, but restricted to 100 hp. All motorcycles for the Japanese home market is restricted to 112mph. Bikes with more powerful engines and unrestricted topspeeds are made for export only. However, a Japanese person is allowed to import an unrestricted bike from another country for private use. What about us importing japanese bikes, are they restricted? and my bike is a 1992 built 1993 model (end of 1992) would it be full power. And a funny thing my bike has 45hp at 14500rpm but redlines at 16500, so what happens after its reached its peak hp, why does it have to rev beyond that mark?