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  1. 400ex heavy duty stud

    Maintenance / Important Information
    i got a 400ex with 30 for compression. the first ring was stuck close. idk why but w.e so i figured since i got it apart. i bought a wiseco 11:1 piston 86mm. nothing crazy. im a bigger kid and i heard that going higher compression you will blow head gaskets alot. so should i just invest in the...