 Long spark plugs are used and positioned concentric to the cylinder.Power output was rated at 157 bhp.The later engine were suffixed "C20XELN" to indicate 'Low Noise' revisions (smaller cylinder head port, cast pistons, and different crank bearing size) in line with EU regulations

In 1988 the "C20XE" was introduced, and was fitted with a catalyst and oxygen sensor in the exhaust.