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I read Rotax 914 has 100 HP @100% throttle  Bore: 79.5 mm (3.13 in)
Stroke: 61 mm (2.4 in)
Displacement: 1,211.2 cc (73.91 cu in)


Where as 912 ULS is 80HP
Bore: 79.5 mm (3.13 in)Stroke: 61 mm (2.40 in) Displacement: 1,211.2 cm3 (73.91 in3)


Why difference of HP, the  cylinder displacement is same on both engine,but HP is different?
Why?

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