The longer stroke creates a stronger more linear power band through the entire RPM range of the engine from low end slow speed corners, to high speed straights! The crankcase and crankshaft are redesigned for better performance and higher fuel economy. The light weigh cooling head is 10 fins high but it sits 8mm lower than the previous Ninja engine. This truly gives the JX21B02 engine a low center of gravity.
Once again the combination of Mugen Seiki Racing and Ninja has made the JX21B02 engine another step above anything other engine on the market!
Low profile light weight cooling head (approx. 8mm lower than the B01A engine)
3-port long stroke piston & sleeve
New profile head button
Black anodized crankcase
Black anodized carburetor with 7mm restrictor
Racing crankshaft with hard DLC (Diamond-Like Carbon) coating
Manufactured by OS Engines