Designer: Roy Amsbury A 120cc four-stroke engine designed for use in a 5in. gauge Hymek locomotive, but suitable for other applications. All construction is fabricated & no castings are necesary. (Vols. 166, 167) Sheet I General arrangement (of one cylinder block only), cylinder head fabrication details, cylinder liners, piston & ring details, water & oil pumps, connecting rod jigs, timing gear cover Sheet 2 Crankshaft, blade & fork connecting rods, cylinder head details, camshaft, pushrods, rockers, tappets etc, petrol pump, inlet manifolds Sheet 3 Cams, sump, carburettor, distributor, contact breaker, flywheel, starter gear