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  1. #1

    Valve springs and retainers

    What's the thoughts on upgrading the factory Yamaha SVHO valve springs when changing to the titanium retainers for say a Stage 2 ski? What is the stock valve spring pressures closed and open?

  2. #2
    butterbean_29512's Avatar
    Join Date
    Sep 2013
    Bennettsville, SC
    Stock valve valvetrain is good to 8650.

  3. #3
    Lake Lion
    Join Date
    Jul 2007
    Dirty Jerzey
    Aftermarket springs are not necessary with the stock supercharger wheel.

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