Motorcycle.com has put together a dyno chart comparing the Z125 Pro’s curve to that of the Grom.
Before the Dyno came out, reviewer Troy Siahaan felt like the Z125 Pro had more power and torque at lower revs than the Honda Grom but will the dyno chart support his “butt dyno” findings?
Contrary to his butt, the dyno shows that the Grom makes more power and torque at lower revs with 8.3 hp at 7800 rpm, and 6.5 lb-ft at 6100 rpm while the Z125 Pro produces 8.3 hp at 7800 rpm, and 6.5 lb-ft at 6100 rpm.
On paper the Grom seems to be winning but on the road, butts are being won over by the Z125’s gearing. The Z125 Pro has a lower gear ratio of around 3.07 compared to the Grom's 2.27, paired with its revvier nature and the Z125 Pro will feel like it has much better acceleration.
Even though the top speed is lower in comparison, its rev happy nature makes this a trade-off that riders can live with. Looking at the chart, we can see that the Grom is leading until they hit the 7400 rpm range but once the aftermarket catches up and the Kawasaki can breathe easier we should be seeing an improvement.
Overall, the power differences between the two models are minute and the number gap can be bridged with a few aftermarket parts.