Fitment reference
Kawasaki KX450 fitment & service data
A dirt built 2006–2026. Use this page to confirm which parts are shared across the run and which change with the model year before you order.
Model data
| Manufacturer | Kawasaki (Japan) |
|---|---|
| Model | KX450 |
| Type | Dirt |
| Production run | 2006–2026 |
| Model years in database | 21 |
| Latest model year | 2026 |
Category-by-category specs
Generic specs that hold across this model run. Always confirm part numbers against your VIN.
Suspension
Rear shocks, fork seals, springs and bushing kits. Spring rate should be matched to rider weight — this is the single most under-done setup step on road motorcycles.
| Rider sag | 30-35mm road, 25-30mm track |
|---|---|
| Fork oil | Model-specific weight and air-gap height |
| Shock service | Every 30,000-40,000 km |
| Install | 150 min · Advanced |
Chain & Sprockets
X-ring and O-ring chains, front and rear sprockets, sliders and adjuster blocks. Always replace the chain and both sprockets as a set — a new chain on worn sprockets destroys itself in weeks.
| Common pitch | 520 / 525 / 530 |
|---|---|
| Seal type | X-ring outlasts O-ring by roughly 30% |
| Service interval | Clean and lube every 600-800 km |
| Install | 90 min · Moderate |
Engine & Filters
Oil filters, air filters, spark plugs and sump hardware. Motorcycles share oil between engine, gearbox and usually a wet clutch, so oil and filter quality matter more than on a car.
| Oil spec | JASO MA2, viscosity per the owner's manual |
|---|---|
| Filter | Spin-on cartridge or paper element, model-specific |
| Interval | 5,000-10,000 km depending on oil type and use |
| Install | 40 min · Easy |
Controls & Levers
Adjustable brake and clutch levers, grips, bar ends and handlebar hardware. Lever reach adjustment is a safety item for smaller hands, not a styling choice.
| Bar diameter | 22mm (7/8in) or 28.6mm (1 1/8in) fat bar |
|---|---|
| Adjustment | Typically 6-position reach |
| Material | Billet 6061 aluminium |
| Install | 25 min · Easy |
Tires & Wheels
Sport, sport-touring and adventure rubber plus valves, rim tape and balance weights. Tires are the single largest handling variable on any motorcycle and the one riders leave longest.
| Sizing | e.g. 120/70 ZR17 front, 180/55 ZR17 rear |
|---|---|
| Pressure | Cold, per the swingarm or chain-guard sticker |
| Service life | 5 years from the DOT date code, regardless of tread |
| Install | 60 min · Advanced |
Maintenance
Chain cleaning kits, lubricants, paddock stands and workshop consumables. A pair of paddock stands turns most chain and tire jobs from a garage bill into a 20-minute task.
| Rear stand | Spool (8mm/10mm bobbins) or universal cradle |
|---|---|
| Chain lube | O-ring and X-ring safe |
| Torque range | 20-100 Nm covers most chassis fasteners |
| Install | 0 min · Easy |
Parts that are year-specific on this bike
- Bodywork and fairing panels — moulded per generation, never cross-generation
- Seat pans and cowls — latch positions change with refreshes
- Wiring, ECU and lighting connectors — often revised mid-run
- Brake master cylinders and lever fitment — check the assembly, not the model name
Torque reference for common jobs
General ranges by thread size for the fasteners on this bike. Confirm the exact figure in the service manual for your model year before final tightening.
| Thread | Tool | Steel | Alloy | Where you meet it |
|---|---|---|---|---|
| M5 | 4 mm hex / 8 mm | 5–7 Nm | 4–5 Nm | Fairing bosses, instrument brackets, small covers |
| M6 | 5 mm hex / 10 mm | 9–12 Nm | 7–10 Nm | Engine covers, sprocket cover, heat shields, light brackets |
| M8 | 6 mm hex / 12–13 mm | 22–26 Nm | 18–22 Nm | Caliper mounts, disc bolts, footpeg hangers, exhaust hangers |
| M10 | 8 mm hex / 14–17 mm | 40–50 Nm | 32–40 Nm | Fork clamp bolts, rear sprocket nuts, shock mounts, engine mounts |
| M12 | 10 mm hex / 19 mm | 75–90 Nm | 60–72 Nm | Front axle, front sprocket nut, swingarm pivot bolts |
| M14 | 22 mm | 115–135 Nm | 95–110 Nm | Rear axle nut on mid-size bikes, some swingarm pivots |
| M16 | 24 mm | 170–200 Nm | 140–165 Nm | Rear axle nut on large bikes, steering-stem nut on some models |
Per-job figures and the full chart: motorcycle torque reference.
Getting the torque right
- Torque figures assume clean, dry, undamaged threads. Oil on a thread can raise the real clamping load by 20% or more at the same wrench reading.
- Where the manual calls for thread-lock, the figure is a wet figure — apply the locker, then torque immediately before it cures.
- Tighten in two passes: to roughly 70% of the figure across all fasteners, then to the full figure in the same order.
- Replace, never reuse, any fastener specified as stretch-to-yield, and always fit a fresh crush washer on a drain plug.
What each job costs on the Kawasaki KX450
Brake pad replacement
0.8 h shop labour · Easy DIY
Chain and sprocket kit replacement
1.5 h shop labour · Moderate DIY
Front and rear tire replacement
1 h shop labour · Advanced DIY
Oil and filter service
0.7 h shop labour · Easy DIY
Fork seal and oil replacement
2.5 h shop labour · Advanced DIY
Slip-on exhaust fitting
1 h shop labour · Moderate DIY
Battery replacement
0.5 h shop labour · Easy DIY
Fairing panel replacement
3 h shop labour · Moderate DIY
Shop parts for the Kawasaki KX450
By model year
2026 KX450
Everything that fits
2025 KX450
Everything that fits
2024 KX450
Everything that fits
2023 KX450
Everything that fits
2022 KX450
Everything that fits
2021 KX450
Everything that fits
2020 KX450
Everything that fits
2019 KX450
Everything that fits
2018 KX450
Everything that fits
2017 KX450
Everything that fits
2016 KX450
Everything that fits
2015 KX450
Everything that fits