· Series 3 : 30 HP: 47 HP: Series 4: 14N: 35 HP: 55 HP: Series 5 : 47 HP: 74 HP: Series 6: 35N: 64 HP: 100 HP: Series 7: 44R: 75 HP: 118 HP: Series 8: 55N: 95 HP: 150 HP : Measuring the Universal Joint: To measure the universal joint, using a tape measure, measure the width from the outside to the outside (B). After getting that measurement, measure the width of .