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2026 Kawasaki KX450
2025 Kawasaki KX450
2025-2026 Kawasaki KX450 Fork Spring Rate Chart
2025-2026 Kawasaki KX450 Shock Spring Rate Chart
2026 Kawasaki KX450
2025 Kawasaki KX450
2025-2026 Kawasaki KX450 Fork Spring Rate Chart
2025-2026 Kawasaki KX450 Shock Spring Rate Chart

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2024-2026 Kawasaki KX450

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Description  

2025-2026 Kawasaki KX450 (KX450MSFNN)

  The 2025-2026 Kawasaki KX450 features a series of updates aimed at improving performance and handling. The 2025-2026 KX450 comes with improved electronics, including a revised ECU mapping for smoother power transitions and enhanced rideability.

Fork Spring Rate Recommendations

  • The 2025-2026 Kawasaki KX450 stock fork spring rate is 5.0N  (0.51kg/mm) with a spring length of 475mm
  • The Showa 49mm twin chamber spring fork is the same since 2024
  • The JBI Spring Rate Chart references the rider weight in casual cloths
    • Ride JBI has already accounted for the additional weight of riding gear
  • Tap the image below to purchase fork springs for the 2025-2026 Kawasaki KX450:

    showa-475mm-fork-spring-ad.png

2025-kx450-fork-spring-rate-chart.png

Motocross
120lbs-135lbs 4.7N
135lbs-155lbs 4.8N
155lbs-170lbs 4.9N
170lbs-185lbs 5.0N (Stock)
185lbs-200lbs 5.1N
200lbs-215lbs 5.2N
215lbs-230lbs 5.3N
230lbs-245lbs 5.4N
245lbs-275lbs 5.4N		 Soft Moto / Open Desert
120lbs-135lbs 4.6N
135lbs-155lbs 4.7N
155lbs-170lbs 4.8N
170lbs-185lbs 4.9N
185lbs-200lbs 5.0N (Stock)
200lbs-215lbs 5.1N
215lbs-230lbs 5.2N
230lbs-245lbs 5.3N
245lbs-275lbs 5.3N
Flowy Single Track (Fast & Slow)
120lbs-135lbs 4.5N
135lbs-155lbs 4.6N
155lbs-170lbs 4.7N
170lbs-185lbs 4.8N
185lbs-200lbs 4.9N
200lbs-215lbs 5.0N (Stock)
215lbs-230lbs 5.1N
230lbs-245lbs 5.2N
245lbs-275lbs 5.3N		 Technical Single Track & Hard Enduro
120lbs-135lbs 4.4N
135lbs-155lbs 4.5N
155lbs-170lbs 4.6N
170lbs-185lbs 4.7N
185lbs-200lbs 4.8N
200lbs-215lbs 4.9N
215lbs-230lbs 5.0N (Stock)
230lbs-245lbs 5.1N
245lbs-275lbs 5.2N

Weight references person in regular everyday casual cloths.
This chart accounts for the common additional weight of riding gear
This info relates to stock valving and modified valving

Shock Spring Rate Recommendations

  • The 2025-2026 Kawasaki KX450 stock shock spring rate is 54N (5.5kg/mm) with a spring length of 240mm
  • The Showa Uni-Trak® shock features a 16mm shock shaft with 50mm main piston.
  • The Kawasaki KX250 and Kawasaki KX450 share the same shock for 2025-2026.
  • The JBI Spring Rate Chart refers to the rider is casual cloths
    • Ride JBI already accounts for the additional weight of riding gear
  • Recommended Rider Sag
    • Riders that are 6ft or taller a Rider Sag Range of 100-103mm is recommended with 6-10mm spring preload
    • Riders that are 5'11" or shorter a Rider Sag Range of 102-105mm is recommended with 6-10mm spring preload
  • Tap the image below to purchase a shock spring for the 2025-2026 Kawasaki KX450:

    showa-shock-spring-ad.png

2025-kx450-shock-spring-rate-chart.png

Motocross
120lbs-135lbs 51N
135lbs-155lbs 52N
155lbs-170lbs 54N (Stock)
170lbs-185lbs 56N
185lbs-200lbs 57N
200lbs-215lbs 58N
215lbs-230lbs 60N
230lbs-245lbs 62N
245lbs-275lbs 63N		 Soft Moto / Open Desert
120lbs-135lbs 51N
135lbs-155lbs 52N
155lbs-170lbs 54N (Stock)
170lbs-185lbs 56N
185lbs-200lbs 57N
200lbs-215lbs 58N
215lbs-230lbs 60N
230lbs-245lbs 62N
245lbs-275lbs 63N
Flowy Single Track (Fast & Slow)
120lbs-135lbs 50N
135lbs-155lbs 51N
155lbs-170lbs 52N
170lbs-185lbs 54N (Stock)
185lbs-200lbs 56N
200lbs-215lbs 57N
215lbs-230lbs 58N
230lbs-245lbs 60N
245lbs-275lbs 62N		 Technical Single Track & Hard Enduro
120lbs-135lbs 50N
135lbs-155lbs 51N
155lbs-170lbs 52N
170lbs-185lbs 54N (Stock)
185lbs-200lbs 56N
200lbs-215lbs 57N
215lbs-230lbs 58N
230lbs-245lbs 60N
245lbs-275lbs 62N

Weight references person in regular everyday casual cloths.
This chart accounts for the common additional weight of riding gear
This info relates to stock valving and modified valving

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