Camshaft selection affects where your engine makes power. The KLX platform has OEM options from other models and aftermarket choices.
Stock Cam Specs
| Spec | KLX250/300 (older) | KLX300R (2020+) / Z250SL |
|---|---|---|
| Exhaust Open | BBDC 61° | BBDC 63° |
| Exhaust Close | ATDC 19° | ATDC 21° |
| Exhaust Duration | 260° | 264° |
| Exhaust Lift | 36.246-36.354mm | 35.743-35.857mm |
| Intake Open | BTDC 22° | BTDC 20° |
| Intake Close | ABDC 62° | ABDC 64° |
| Intake Duration | 264° | 264° |
| Intake Lift | 36.246-36.354mm | 35.743-35.857mm |
| LSA | 110.5° | 111.5° |
Generation Differences
Older KLX250/300 cams:
- Higher lift (36.24mm)
- Shorter exhaust duration (260°)
- More low-end torque
- Better for trail/technical riding
Newer KLX300R/Z250SL cams (2020+):
- Less lift (35.74mm)
- Wider exhaust duration (264°)
- Extended power band to 10,000 RPM with unrestricted ECU
- Better for racing/high-speed applications
KLX250/KLX300 Cams
All KLX250 and KLX300 models (including 2021+) share the same camshafts. This is confirmed by cross-referencing part numbers and service manual specs.
All include the KACR (Kawasaki Automatic Compression Release) mechanism for easy starting.
Upgrade Option: KLX300R / Z250SL Cams
Updated Kawasaki OEM camshafts with better top-end power are found in:
- Ninja Z250SL
- KLX300R (2020+)
- KLX300 (2020+)
Note: 2020+ KLX300, KLX300R, and Z250SL all use identical cam profiles. The only difference is that KLX300 has auto-decompression while KLX300R does not.
Part Numbers
| Component | Part Number |
|---|---|
| Intake cam | 12044-0786 / 12044-1505 |
| Exhaust cam | 12044-0787 / 12044-1506 |
| Timing gear (32T) | 12046-0576 |
Important: The timing gear/sprocket is different from KLX250/300. See the video for details.
Aftermarket Option: Keng Engine
Keng Engine produces custom camshafts for their engine builds. These are designed for high-performance applications.
Contact them directly for specs and availability.
Video Walkthrough
Is It Worth It?
For most riders, camshafts are a later-stage modification. Prioritize:
- Intake improvements and exhaust upgrade
- ECU tuning
- Big bore kit (for KLX250)
- Then camshafts for top-end power
The KLX300R cams offer a modest top-end gain while maintaining OEM reliability.
Related
- Engine Guide - Overview of all performance modifications
- Big Bore Kit - Often paired with cam upgrade
- ECU Tuning - Fuel management for modified engines