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  • XCELDYNE VALVE SPRINGS IN/EXH - PSIMX2004

    Purpose-built racing valve springs from the only dedicated racing spring manufacturer in the country. Made from the highest quality Kobe spring wire. Utilizes all of the same features and processes that we design into our entire racing spring line. Designed for use with most cam grinds. Single spring, low-drag design done right the first time.None of the crutched two-spring designs out there add to your valvetrain mass which in turn costs you horsepower. Set of 5. Must use with Spring Seats Mfr# XSSM43000This item fits the following models: 2003-2009 Yamaha WR450F2011-2012 Yamaha WR450F2004-2009 Yamaha YFZ4502006-2007 Yamaha YFZ450 Bill Balance Edition2007-2008 Yamaha YFZ450 SE2009-2012 Yamaha YFZ450R2009-2012 Yamaha YFZ450R SE2010-2011 Yamaha YFZ450X2010 Yamaha YFZ450X Bill Balance2011 Yamaha YFZ450X SE2003-2012 Yamaha YZ450F

    • ASIN: B000MWU1V4
    • Brand: Xceldyne Technologies
    • ASIN: B000MWU1V4
    • Part No: PSIMX2004

  • XCELDYNE VALVETRAIN VALVE SPRINGS RETAINERS IN/EX XREM12000 CRF250R 2010 , 2 PER KIT

    Lightweight CNC-machined titanium retainers greatly reduce valvetrain mass and increase engine RPM. Increases valve spring life over heavier, stock steel retainers. Use in conjunction with most stock springs and all of CV4s racing valve springs. When used with Xceldyne machined valve locks, you have a perfect retainer/lock/stem fit for unprecedented high-rpm valvetrain control. Set of 2. Titanium Retainer - Fits Stock SpringsHonda CRF250R 2004-2013

    • ASIN: B0041CAJG8
    • Brand: Xceldyne Technologies
    • ASIN: B0041CAJG8
    • Part No: XREM12000

  • XCELDYNE VALVE SPRING RETAINER - XREM22000

    Xceldyne Spring Retainers

    • ASIN: B0022Y84GE
    • Brand: Xceldyne Technologies
    • ASIN: B0022Y84GE
    • Part No: XREM22000

  • Xceldyne Exhaust Valve Springs PSIMX2404

    VALVE SPRINGS EXHAUST

    • ASIN: B0041CG8MM
    • Brand: CV Products
    • ASIN: B0041CG8MM
    • Part No: 0926-0649

  • Xceldyne Technologies Intake Valve Springs

    Purpose-built racing valve springs from the only dedicated racing spring manufacturer in the country. Made from the highest quality Kobe spring wire. Utilizes all of the same features and processes that we design into our entire racing spring line. Designed for use with most cam grinds. Single spring, low-drag design done right the first time.None of the crutched two-spring designs out there add to your valvetrain mass which in turn costs you horsepower. Set of 5. Must use with Spring Seats Mfr# XSSM43000Yamaha WR450F 2011-2012Yamaha WR450F 2003-2009Yamaha YFZ450 2004-2009Yamaha YFZ450 Bill Balance Edition 2006-2007Yamaha YFZ450 SE 2007-2008Yamaha YFZ450R 2009-2012Yamaha YFZ450R SE 2009-2012Yamaha YFZ450X 2010-2011Yamaha YFZ450X Bill Balance 2010Yamaha YFZ450X SE 2011Yamaha YZ450F 2003-2012

    • ASIN: B0041CG8KE
    • Brand: Xceldyne Technologies
    • ASIN: B0041CG8KE
    • Part No: PSIMX2004

  • Xceldyne Technologies Intake Valve Springs

    XCELDYNE VALVE SPRINGS INTAKE. Part Number PSIMX1601 / 0926-0632

    • ASIN: B0022XPP6M
    • Brand: Xceldyne Technologies
    • ASIN: B0022XPP6M
    • Part No: PSIMX1601

  • Xceldyne Technologies Intake Valve Springs

    Purpose-built racing valve springs from the only dedicated racing spring manufacturer in the country. Made from the highest quality Kobe spring wire. Utilizes all of the same features and processes that we design into our entire racing spring line. Designed for use with most cam grinds. Single spring, low-drag design done right the first time.None of the crutched two-spring designs out there add to your valvetrain mass which in turn costs you horsepower. FOR USE WITH TI VALVE ONLYHonda CRF250R 2010-2014

    • ASIN: B004O42MHC
    • Brand: Xceldyne Technologies
    • ASIN: B004O42MHC
    • Part No: PSIMX2006

  • Xceldyne Technologies Exhaust Valve Spring Seats

    Precision CNC machined from 8620 case hadened steel. High tolerances ensure seats are flat for longest possible life. Cheaper non-flat seats fracture and eventually disintegrate at rpm which distributes like shrapnel throughout your engine. Pad is parallel to bottom surface for consistent spring pressures. Specially designed for CV4s valve springs. Must be used with PSI Springs. Sold as a set of 2.Yamaha WR250F 2001-2009Yamaha YZ250F 2002-2012

    • ASIN: B0041CE8CY
    • Brand: Xceldyne Technologies
    • ASIN: B0041CE8CY
    • Part No: XSSM42001

  • Xceldyne Technologies Exhaust Valve Springs

    Purpose-built racing valve springs from the only dedicated racing spring manufacturer in the country. Made from the highest quality Kobe spring wire. Utilizes all of the same features and processes that we design into our entire racing spring line. Designed for use with most cam grinds. Single spring, low-drag design done right the first time.None of the crutched two-spring designs out there add to your valvetrain mass which in turn costs you horsepower. USE WITH OEM STEEL VALVEHonda CRF250R 2010-2014

    • ASIN: B004O44KLI
    • Brand: Xceldyne Technologies
    • ASIN: B004O44KLI
    • Part No: PSIMX2007

  • Xceldyne Valve Spring Kit CVVSK23000

    VALVE SPRING KIT

    • ASIN: B003RF6Z2C
    • Brand: CV Products
    • ASIN: B003RF6Z2C
    • Part No: 0926-1087

  • COMP Cams Valve Springs 1.550in Inter-Fi

    • ASIN:
    • Model: 943-16
    • Color: Multicolor

  • COMP Cams Valve Springs High Performance

    • ASIN:
    • Model: 26918-16
    • Color: Multicolor

  • Pro-X 28.SIS2414-2 Steel Intake Valve and Spring Kit

    • ASIN:
    • Model: Steel Intake Valve and Spring Kit