Kawasaki to introduce Ninja ZX-4R! | Page 5 | GTAMotorcycle.com

Kawasaki to introduce Ninja ZX-4R!

Graves has posted dyno charts of stock bike versus their exhaust + unrestricted ECU flash.

At one point the note on the Kawasaki Canada website indicated "a maximum RPM of 11,500", but the stock dyno confirms the updated note which now reads "The Ninja ZX-4R and Ninja ZX-4RR reach max power at 11,500 rpm in Canada due to noise regulations".

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I don't see any org putting these in the 300/400 lightweight classes. With ~75 peak hp and 415 pounds, it would make a lot more sense to slot them in with the R7/SV650/Ninja650.
 
Ash said:
I don't see any org putting these in the 300/400 lightweight classes. With ~75 peak hp and 415 pounds, it would make a lot more sense to slot them in with the R7/SV650/Ninja650.
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Not really fair to punish a bike because it's better than it's direct rivals as far as displacement is concerned. An R7 for example may weight about the same, but has nearly double the displacement and nearly double the torque. Fighting with an R7 through all the turns only to have it walk away on the straight is balls. Not to mention, FZR400's were never disallowed from the ltwt class (afaik) and they were also a 4 cylinder 400cc bike.

Triumph or MV need to come out with a 3 cylinder 375.
 
A smidge over (indicated) 100 km/h at rev limit in 1st gear sounds about right relative to a stock FZR400 (which didn't rev as high). It's a given that it will want shorter gearing for racetrack duty.
 
Renboy said:
Not really fair to punish a bike because it's better than it's direct rivals as far as displacement is concerned. An R7 for example may weight about the same, but has nearly double the displacement and nearly double the torque. Fighting with an R7 through all the turns only to have it walk away on the straight is balls. Not to mention, FZR400's were never disallowed from the ltwt class (afaik) and they were also a 4 cylinder 400cc bike.

Triumph or MV need to come out with a 3 cylinder 375.
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A 4 cylinder 400 is not a direct rival to a twin cylinder 400 and at CSBK at least the FZR400 is not allowed
 
TSC_113 said:
A 4 cylinder 400 is not a direct rival to a twin cylinder 400 and at CSBK at least the FZR400 is not allowed
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Yup. CSBK's lightweight class calls out specific models rather than just general CC/cylinder limits and so the ZX-4R/RR is already not eligible. But even so, CSBK enforces power and minimum weight restrictions in the class to keep an even playing field for older models. A stock Ninja 400 is already close to the power cap (45hp rwhp for the Ninja 400) and CSBK recommends intake restrictors for it. If they wanted to allow ZX-4R/RRs in the class it might end up being even more restricted than stock.

For RACE/SuperSeries, the ZX-4R/RR would not be eligible for Lightweight Production. It would be eligible for Lightweight Superbike, where it would compete against the 650cc twins.

SOAR's Lightweight Superbike class definition currently would allow the ZX-4R/RR.
 
Will be curious to see other third party dyno results when more people have them, great for back to back comparisons of mods but not so much absolute numbers. Does look good so far though.
 
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Stranger things have happened. At one point Kawasaki offered the KLX400, which was just a Suzuki DRZ400 with a Kawasaki badge and green bodywork.
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