MotoAmerica Updates Junior Cup Technical Regulations To Match Supersport 300 World Championship
[I]In today's release from the FIM it was explained that the new technical rule updates were intended to balance the performance of the popular motorcycles used in the class (Kawasaki Ninja 400, KTM RC 390 R, and Yamaha YZF-R3) so they were all close to the level of the “middle performing” machine, the KTM.
To accomplish this, FIM and MotoAmerica are allowing the Yamaha YZF-R3 to be fitted with an approved engine kit to raise its performance and restricting the performance of the Kawasaki Ninja 400 by mandating that it must be fitted with an inlet restrictor plate.
Maximum RPM limits will still be used in both series. MotoAmerica’s initial rev limiter settings at the start of the 2019 season (as set in the required HM Quickshifter software update) will be:
Motorcycle Max. rpm
Honda CBR500R 10,000 rpm
Kawasaki Ninja 300 13,000 rpm
Kawasaki Ninja 400 10,350 rpm
Yamaha YZF-R3 13,000 rpm
KTM RC 390/R 11,000 rpm
In addition, weight limits will be used for both the motorcycles and combined motorcycle and rider weights.
The weight of the rider will be measured in full riding gear, and the weight of the bike will be measured as it comes off the racetrack.
There will be a “Soft Maximum Weight” and a “Hard Minimum Weight” limit for each model of motorcycle. If a bike exceeds its Soft Maximum Weight limit the combined bike and rider minimum weight limit does not have to be met. But the bike by itself may never be below the Hard Minimum Weight limit.
The intent is to set a limit to the amount of ballast a motorcycle must carry to ease the setting up of the motorcycle.
Motorcycle Hard Min. Weight - Soft Max. Weight - Comb. Bike/Rider Max. Weight
Honda CBR500R 323 lbs./147 kg 352 lbs./160 kg 462 lbs./210 kg.
Kawasaki Ninja 300 293 lbs./133 kg 321 lbs./146 kg 440 lbs./200 kg
Kawasaki Ninja 400 301 lbs./137 kg 330 lbs./150 kg 462 lbs./210 kg
KTM RC 390/R 293 lbs./133 kg 321 lbs./146 kg 444 lbs./202 kg
Yamaha YZF-R3 301 lbs./137 kg 330 lbs./150 kg 449 lbs./204 kg
The air box modifications introduced early in the 2018 season will still be allowed.
For more details, see MotoAmerica Technical Bulletin 08-2018 (updated 3/21/2019) here: http://www.motoamericaregistration.c...%2008-2018.pdf