sentences:  The PR3, PR4 & PR5 have 4-stroke single-cylinder engines closely based on the Honda XR series engines; and the AJP PR series bikes may be seen as updated equivalents of Honda's XR200 & XR250 of the 1980s.Each AJP bike has a modern lightweight frame, front & rear disc brakes, a cast-alloy swingarm and a lightweight composite silencer.Video clips