JBS Kawasaki KRX and KRX4 1000 Primary Spring

The JBS Kawasaki KRX and KRX4 1000 Primary Spring is built for stronger low-end throttle response and faster shift out once the RPMs are up.

This primary spring is 75% stiffer on the bottom end for awesome throttle response down low, while being 15% softer on the top end for faster 0-60 times. It is designed to work well with stock tires, larger tires, and boosted applications.

Made in the USA by HYPERCO for JBS, this is a strong primary spring upgrade for Kawasaki KRX and KRX4 1000 owners looking for better clutch performance.

• 75% stiffer on the bottom end for improved low-end throttle response
• 15% softer on the top end for faster shift out once RPMs are up
• Helps support faster 0-60 times
• Designed for stock tires, larger tires, and boosted applications
• Made in the USA by HYPERCO for JBS
• Built as a primary spring upgrade for Kawasaki KRX and KRX4 1000 models