The 351R uses a 14.5mm crank (compared to the 14.0mm on the RP9). This achieves more torque in the bottom end (when compared to the RP9).
Max Power 351R 2022 Long Stroke .21 engine for 1/8 2022 Edition
Pre-run by Max, DLC coated crank, black crankcase, ceramic bearing. 25% Ready. Best paired with the MX-02099 straight manifold and 2164 pipe.
Full details: https://rcmaxpower.com/en/home/44-mx-351-35-cc-on-...
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