Kawasaki KX450F Motocross Bikes For Sale On eBay

The Kawasaki KX450F is a high-performance 450cc motocross bike built for experienced riders seeking serious track capability.
Typical specs (guide only – always check with the manufacturer or original spec sheet for exact model details):

• Displacement: ~449 cm³
• Frame: aluminium perimeter frame
• Front suspension: inverted forks
• Seat height: ~960 mm
• Weight: ~112 kg

These are rough ranges. Always check with the manufacturer or an official source for the specific model year you’re looking at.

Buying tips for a used KX450F

Engine & hours
Check that the valve clearances, cam chain slack, and service history are documented. On 2014–2018 generation bikes, the coolant temperature sensor is mounted on the back of the cylinder, making it vulnerable to damage from dirt or impact. Some owners report early piston cracking or failure when aggressive remaps or sub-par fuel are used — so ask whether the ECU has been modified.
Also, on more recent models (2022+), some users report problems with oiling or cam journal wear, possibly linked to oil flow or gasket residue issues — worth asking whether any top-end rebuilds have been done.

Chassis & suspension
Pre-2019 models used air forks, which are more prone to seal leaks, inconsistent damping, and higher maintenance than coil-spring forks. Watch for signs of oil weep or sagging in the forks. Inspect frame welds, swingarm pivots, linkage bearings, and look for any cracks or misalignment. In some years, rear mount tabs or shock bosses have been mentioned in forums as stress points — check those carefully for any repair work or reinforcement.

Consumables
The chain guide/slider is known to wear fast under heavy use — examine it closely for deep wear or embedding. Rubber bar-mount inserts (especially in earlier years) often fail in falls or crashes, so check for damage or deformation. Hardware (bolts, fasteners) can strip or loosen under vibration — ask if thread locking compounds were used during maintenance, and always verify torque spec compliance.

Alternatives to consider

If listings for the KX450F are limited or priced too high, you might also explore these models):

• Yamaha YZ450F

• Honda CRF450R