There's a few differences between the US and MXGP HRC bikes. Bobryshev's for instance has Pirelli tires, a Rekluse clutch, a different Yoshimura head pipe (with resonance chamber), Showa spring forks (instead of KYB air), plus a few other changes.
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Vital MX Pit Bits: 2017 MXGP of Valkenswaard