Norton Racing Race Spec Throttle Kit – Kawasaki Ninja 400 / Z400

From: $209.95

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*This throttle kit is not legal for MotoAmerica Junior Cup.  We recommend and use the Motion Pro Rev2 Throttle Kit for all Junior Cup bikes.

***You will need to replace the start/kill switch when you install the Norton Racing Race Spec Throttle Kit on your Kawasaki Ninja 400 because the OEM start/kill switch is part of the throttle housing.

There are a few options available for this:

The Domino Kawasaki Ninja 400 kill switch is an inexpensive, plug-and-play replacement switch for the Kawasaki Ninja 400.

The Kawasaki Ninja 400 Kill Switch w/ Integrated Keyswitch Elimination Harness is a plug-and-play harness for the Kawasaki Ninja 400 that also bypasses the OEM keyswitch so the heavy keyswitch can be removed.  This is recommended for racers, as it’s a better and cheaper option than purchasing a Kill Switch and Keyswitch Eliminator Harness separately.

*This kit is for closed course use only.


SKU: _000035 Categories: ,


Norton Racing Race Spec Throttle Kit

The Norton Racing Race Spec Throttle Kit is the result of testing all of the different throttle options on the market and still wanting more…

The other kits are great, but the new Norton Racing kit offers the largest range of adjustment available and it is designed specifically for the Kawasaki Ninja 400, not an entire range of different bikes. It comes with 3 different lobed cams that offer 3 different turn ranges for your throttle so you can get it the way you like it.  The longest throw cam offers a throw length that is slightly shorter than stock.  The medium throw cam offers a throw length similar to other throttles on the market like the Motion Pro.  And the shortest throw cam is shorter than anything else available, because let’s face it, on a 48 HP motorcycle, it’s nice to be able to get all 48 HP without twisting your whole arm around.

The throttle housing used in this kit is custom made for us by Domino Italy, and is top shelf.  The cast aluminum housing features a pulley and bushing for the smoothest throttle pull available for the Ninja 400.  The throttle tube is billet machined aluminum with Delrin bushings for the smoothest twist on the handle bars.  Stop trying to decide which throttle length is right for you, this one tops them all.

As some of you have probably figured out, when you cut the throttle throw in half, the force needed to twist it doubles.  This starts to become annoying with a really short throttle throw, and often will cause grip to start to twist as you pull hard on the throttle.  This kit will work with the OEM throttle return spring, but we highly recommend using our soft pull throttle return spring for a much softer, smoother throttle action.

This throttle is compatible with aftermarket radial master cylinders such as the Brembo RCS14.

Additional information

Weight 1.75 lbs
Dimensions 14 × 12.5 × 3 in


  1. Devin Francis

    Definitely spend the 44 bucks on the soft return spring. Instructions would have made the process a little smoother for me as I have never installed a kit like this before .Not complaint just a suggestion luckily I figure it out just took my slow ass a minute. Also I recommend listening to their recommendation on getting the integrated kill switch/keyless option. Super simple plug in play no instructions needed even for me lol.

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