Yamaha SR 400 is designed around an engine that is an 399 cc, air cooled, single cylinder. The engine has a bore and stroke measuring 87 mm x 67.2 mm, and has a compression ratio of 8.5:1. The engine is able to generate a total of 27 horsepower. When this output is compared against the motorcycle's weight in kilograms of 152, which equates to 334.4 pounds, the pounds per horsepower can now be precisely measured in a determination which is a very accurate reflection of this particular motorcycle's total performance on the street or track. In the case of this bike, the power to weight ratio is 12.39. That figure equates out to a Murdercycle Rating of "H": BORDERLINE which means that if a rider has had at least one year of experience on a smaller motorcycle or scooter, this may be a proper motorcycle to step up to.

Yamaha YZF 600 R Thunder Cat is a motorcycle that has an engine which is an 599 cc, water cooled, 4 - cylinders in line. The engine is designed with a bore and stroke of 62 mm x 49.6 mm, which results in a compression ratio of 12:1. The powerplant creates a total of 100 horsepower. When this maximum power generation is divided by the vehicle's dry weight in kilograms of 187, which equates to 411.4 pounds, the actual ratio of this motorcycle's actual performance while being ridden can be determined with a high degree of accuracy. The pounds per horsepower determines what the power to weight ratio is, and in this bike's case, that figure is 4.11. This figure means that this motorcycle has a Murdercycle Rating of "C": EXCESSIVE which means that it should only be operated on a racetrack by at least amateur racers who already have gained a measure of experience, and never on a public highway.

Yamaha YZF-R6 features a motor engineered as a 600 cc, liquid cooled, 4 - cylinders in line. The motor's bore and stroke is 67 mm x 42.5 mm, and has a compression ratio of 12.8:1. The engine cranks out a total of 129 horsepower. When this output is compared against the motorcycle's weight in kilograms of 166, which converts out to 365.2 pounds, we end up with a calculation of pounds per horsepower, which is an industry standard manner of determining the overall real world power of the vehicle. In this motorcycle's case, the power to weight ratio is 2.83. The final result is that this motorcycle has a Murdercycle Rating of "B": HIGH-DANGER which means that no one other than a motorcycle racer with at least a year or so of experience should ride it, and then only on a race or test track.

Yamaha XVS 650 Dragstar Classic has an engine that is set up as an 649 cc, air cooled, 70° v-twin. The engine has a bore and stroke measuring 81 mm x 63 mm, providing a compression ratio of 9:1. The motor powers the rear wheel with a total of 40 horsepower. Those horses can be equated to the bike's weight in kilograms of 229, which in American units converts out to be 503.8 pounds, the calculation of pounds per horsepower is now possible: a measurement that is generally utilized to determine the motorcycle's overall performance. In this case, the power to weight ratio is 12.6. Therefore, it can be concluded that this bike has a Murdercycle Rating of "H": BORDERLINE which means that if a rider has had at least one year of experience on a smaller motorcycle or scooter, this may be a proper motorcycle to step up to.

Yamaha V Star Classic is designed with an engine configured as a 649 cc, air cooled, 70° v-twin. The motor's bore and stroke is 81 mm x 63 mm, which gives the engine a compression ratio of 9:1. The engine generates a strong 40 horsepower. If you take that amount of power and equate it with the motorcycle's dry weight in kilograms of 229, a weight that is equivalent to 503.8 pounds, we can now calculate the ratio of pounds per horsepower, a fairly standard calculation in the motor vehicle world which will allow you to determine the motorcycle's actual performance on the street. In the case of this bike, its power to weight ratio is 12.6. Therefore, this motorcycle has earned a Murdercycle Rating of "H": BORDERLINE which means that if a rider has had at least one year of experience on a smaller motorcycle or scooter, this may be a proper motorcycle to step up to.