The '05-'06 and '07-'08 Kawasaki ZX-6R ECus possess multiple ignition maps and by performing the jumper mod it'll unlock free horsepower hidden inside.
That's free horsepower and a lot of it. Peak power gains checked in at 6.1 HP and the increase after peak (on the over-rev) is stunning.
Even though Momma always said, “There’s no such thing as a free lunch,” Kawasaki fans have been telling us otherwise. Rumor has it that by connecting a few wires and completing the “jumper mod,” your ZX-6R will instantly gain free top-end power. According to the myth, not all ZX-6Rs have the hidden power locked within—just the 2005-2008 models. With evidence aplenty across the Internet it was hard to believe this rumor might be pure hogwash, but we hit the dyno to confirm or refute it anyways.
** Since the most accessible place to accurately test power gains is a dyno (track testing is also great, but a bit more complicated) we paid a visit to our local dyno shop to see where the truth lies.
With a stock 2008 ZX-6R up to normal operating temperature we made a succession of pulls to the tune of a lackluster 98.7 HP and 43.3 LB-FT at the tire. Roughly five minutes later the drum was again spun with the jumper mod in place. This time, the Ninja threw down 104.8 HP and 43.1 LB-FT at identical coolant and oil temps.
As always, the runs were done on the same dyno, on the same day and without removing the bike from the dyno or varying strap tension.
In a few short moments a small piece of metal bridged the gap between two wires on the ’08 ZX-6R and successfully increased power by 6.1 HP with little changes to torque at peak. Along with the solid outright gains, a closer look at the dyno revealed the stock curve falling off beyond 12,000 RPM. With the jumper mod in place however, power continued to climb to 14,000 RPM before eventually signing off. This increase in top-end steam not only produced harder acceleration, but also more over-rev, which makes it easier to carry a lower gear between corners instead of up-shifting. Also note that while outright torque numbers didn’t change, the torque curve held on longer into the rev range with the jumper mod installed.
This bump in top-end power comes courtesy of unlocking the European map that utilizes a more aggressive timing curve. The North American map pulls timing up top for emissions reasons. We weren’t able to get anyone on record at Team Green to explain the reasoning for the softer timing curve and power delivery, but we suspect it’s to help pass tail pipe and sound regulations since other bikes like the current CBR1000RR, ZX-10R and previous R6 models have had similarly soft ignition maps from the factory.
6.1 Horsepower gained from Jumper Mod
*For brevity's sake we omitted the process of completing the jumper mod since a simple internet search will unearth a mountain of results.