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  1. MXZX Race Sleds
    Does anyone know, what the Combustion Chamber CC is, of the std. 670, and the 670HO head? I also need the CC of the 583, & 617 head if you know it also. Is there a formula, to find out what your compression ratio really is? Rotax, reccomends 92 Octane in all their Ultralight engines, 377UL...
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