Last week we brought you a report that said that the Kawasaki Ninja ZX-25R made over 40hp at the wheel at a recent dyno test.
The report attributed no source, which made that horsepower claim a bit hard to verify, but today we seem to have found where that power figure came from, thanks to our friends in Indonesia at the TMC Blog.
Slovenian exhaust maker Akrapovič briefly listed the Kawasaki Ninja ZX-25R on its website, showing both the stock horsepower and torque figures for the quarter-liter four-cylinder monster, but also the gains made from the company’s racing exhaust line.
Recording 41.4hp (30.9 kW) at the rear wheel, the Akrapovič numbers (screen shots below) are the same as those quoted in last week’s report, and now we also have the added benefit of seeing what a high-quality exhaust can do for the Kawasaki Ninja ZX-25R.
Adding, 1.3hp to the peak power figure, the Akrapovič exhaust sees its biggest gains further down the rev range, boosting 2.5hp at 9,800 rpm. While that doesn’t sound like a big amount, consider that the 2.5hp bump is still a 6% power increase.
With peak torque going from 15.3 lbs•ft (20.8 Nm) to 15.9 lbs•ft (21.5 Nm), the story is again the same, with the biggest improvements coming lower in the revs, with Akrapovič reporting 1.3 lbs•ft gain at 9,600 rpm.
The real noteworthy gain from the Akrapovič racing line exhaust though is the nearly 10 lbs (4.4 kg) it drops from the mass of the Kawasaki Ninja ZX-25R, which is nothing to scuff at.
Kawasaki is of course mum on any official details on the Ninja ZX-25R that would give us insights as to the performance characteristics of this unique motorcycle. From this data point found on the Akrapovič dyno though, we would expect the Japanese brand to claim a 50 PS power figure at the crank when it officially debuts, which works out to be 49hp.
That is a pretty stout number for a 250cc machine that has to live in a world of super-stringent emission regulations. It also bodes well for any tuners who get their hands on the Kawasaki Ninja ZX-25R, and let the 17,000 rpm monster scream to its full potential.
Source: TMC Blog