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Team Orion官方正式公布了CRF 21美国版引擎。这款引擎经过长队车手Ryan Cavalieri, Jorn Neumann and Philipp Guschl的通力合作研发，取得了不少进步。很多部件都比以前轻。另外现有的CRF引擎显得太强劲了，所以他们研发了新版本，在保持惊人的扭力的同时，动力更柔和，以达到厂车手的要求。同时，这样也能提高燃油经济性。
New parts included in the US Spec edition engine:
- New crankcase with modified machining process: better tolerances for more power in hot conditions.
- New black anodized back plate for smoother throttle response.
- Lightened head for better handling of the car, same good cooling efficiency.
- New generation crankshaft with closer timing and smaller inside hole to increase throttle response.
- New carburator for smoother use.
- New venturi set of 8, 7 and 6.5 mm with CRF design for better torque and mileage.
- Main needle support: stronger material and marked for easier tuning.
- Throttle unibal: marked for easier tuning.
- New bottom needle for smoohter response and better mileage.
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