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#hicompression

  1. Going to do a 686 big bore with 11.1 compression

    Raptor 660 Modifications
    I'm wanting to go with an 11.1 hi comp piston when i do my big bore 686cc next riding season. Also I will probably be adding a stage 1 cam. I know stage 2 is better but I need to save money somewhere☹️. Can I run 91 octane? That's all we have around here. 02 raptor 660
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