sentences:  The FIM eventually included the 1,200 cc displacement limit for twins in the superbike rules.According to the new rules, twin-cylinder motorcycles would be 6 kg heavier than four-cylinder machines (168 kg to 162 kg) and would also have a 50 mm air restrictor fitted.The weight limit and the intake-restrictor size of twin machines would be updated, if needed, during the Championship, by a system analysing the race points obtained.