The answer is no. Inline four-cylinder engines have perfect primary balance but a secondary out of balance force at twice crankshaft rotational speed. Balance shafts are used on larger capacity four-cylinder engines to balance this secondary force, but the lighter reciprocating masses of a 1.6 litre capacity engine mean it doesn't require a balance shaft. Cars with balance shafts usually have less crankshaft counterweighting, so I am surprised that it was possible to remove the balance shafts and for the cars to remain driveable. I would have thought the vibration would have been incredible.