Crankcase, Crankshaft, Transmission & Balancer Specifications For Your 2009 – 2010 Honda CRF450R Dirt Bike
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Part | Standard (mm) | Service Limit (mm) |
Crankshaft | ||
| – Side Clearance | 0.30 – 0.55 | 0.6 |
| – Radial Clearance | 0.006 – 0.018 | 0.05 |
| – Runout – R | – | 0.03 |
| – Runout – L | – | 0.05 |
Transmission | ||
| Gear I.D. | ||
| – M4 | 28.007 – 28.028 | 28.05 |
| – M5 | 28.020 – 28.033 | 28.07 |
| – C2 | 30.020 – 30.041 | 30.07 |
| – C3 | 28.020 – 28.041 | 28.07 |
| Bushing O.D. | ||
| – M4, M5, C3 | 27.959 – 27.980 | 27.95 |
| – C2 | 29.979 – 30.000 | 29.95 |
| Bushing I.D. | ||
| – M5 | 25.000 – 25.021 | 25.04 |
| – C2 | 27.000 – 27.021 | 27.04 |
| – C3 | 27.952 – 25.006 | 25.02 |
| Gear-to-Bushing Clearance | ||
| – M4 | 0.027 – 0.069 | 0.11 |
| – M5 | 0.040 – 0.074 | 0.12 |
| – C2 | 0.020 – 0.062 | 0.12 |
| – C3 | 0.040 – 0.082 | 0.12 |
| Mainshaft O.D. | ||
| – At M5 Bushing | 24.959 – 24.980 | 24.94 |
| Countershaft O.D. | ||
| – At C2 Bushing | 26.959 – 26.980 | 24.94 |
| – At C3 Bushing | 24.959 – 24.980 | 24.94 |
| Bushing-to-Shaft Clearance | ||
| – M5, C2 | 0.020 – 0.062 | 0.12 |
| – C3 | 0.005 – 0.047 | 0.08 |
Shift Fork, Shift Fork Shaft | ||
| Fork Claw Thickness | 4.93 – 5.00 | 4.8 |
| Shift Fork I.D. | ||
| – Center | 11.003 – 11.024 | 11.04 |
| – Right | 12.035 – 12.056 | 10.07 |
| – Left | 12.035 – 12.056 | 10.07 |
| Shift Fork O.D. | ||
| – Center | 10.969 – 10.980 | 10.96 |
| – Right | 11.966 – 11.984 | 11.95 |
| – Left | 11.966 – 11.984 | 11.95 |
Keep Your ’09-’10 CRF450r Running Right!
- Service Specification
- Clutch Replacement
- Fuel System Service
- Engine Top End
- Brakes
- Exhaust
- Front Suspension & Steering
- Rear Suspension
- Wheels & Tires
- Kickstarter
- External Shift Linkage
