Power to weight is the power output of the engine divided by the weight of the bike.
It's a way to compare different machines. For example a tank may have a much bigger power output from its engine than the FJR does. But the tank weighs a heck of a lot more. Overall, the tank's power to weight ratio would be a lot less. The FJR would beat it in a drag race.
I guess the actual numbers quoted depend on how you measure power (kilowatts, horse power) and weight (pounds, kilogrammes) etc. Of course, when comparing different machines, they all need to have their power to weight ratio calculated the same way. The bigger the number, the bigger the relative power.
I was being continually confused by variations in performance figures until I realised that some HP ratings are in imperial units and others are in metric HP or PS. For true apples vs apples performance specs I've gone to the Kilowatt as there is no confusion or overstated understanding:
- 1 KW = 1000watts
- 1 Imp HP = 745.7watts
- 1 metric HP = 735.5watts