CSBK revises restrictions for Ninja 400


Professional Motorsports Productions, organizers of the Mopar CSBK National roadracing championships, have updated requirements for the 2018 Kawasaki Ninja 400 when entered in the new Amateur Lightweight Sport Bike category.  The strong performance of the new-for-2018 Kawasaki is an issue for various racing series trying for parity among the brands in the smaller production-based classes.

Starting at the opening race of the 2018 Series at Shannonville Motorsport Park, ON, this weekend, May 25-27, the newest Ninja will be recommended to run with a restrictor in the inlet manifold for each cylinder.  This device, available for free from CSBK, will allow the Kawasaki to run on equal footing with other machines in the new National racing class.

With the latest Rules changes in mind, the 2018 Kawasaki Ninja 400 will no longer have any special allowances in the CSBK Rules.  Now the Kawasaki will be restricted to a maximum 42 horsepower and a minimum weight of 320 pounds, both measured post race.  These are the same standards as used for most of the other machines eligible for the Lightweight Sport Bike race division.

“We have been busy working on the best solution for the new Kawasaki since the first units arrived in Canada at the start of February,” explains CSBK boss Colin Fraser. “Thanks to the help of Canadian Kawasaki, we have been able to work on various solutions at Brooklin Cycle Racing with two of the CSBK Official Series Dynojet rear-wheel Dynamometers.

“We are confident that this solution will work well, and not provide any new issues,” continues Fraser.  “However, LTWT competitors are not required to run the series-provided Restrictors; competitors can devise their own solutions, as long as they meet the requirements of the Rulebook.  Our solution is an easy fix, and we are happy to provide this method to our Amateur Lightweight Sport Bike category racers at no charge.”

Restrictors used in the new Ninjas should allow racers to tune their machines and still meet National series guidelines.  It will remain the responsibility of each racer to be sure his or her bike meets the posted restrictions, and can pass Technical Inspection after any on-track CSBK session.

The update of the Rules pertaining to the 2018 Kawasaki Ninja 400 also mean that competitors can also run a full race exhaust system, if that fits in with their other tuning parameter for the National class rules.