Power Sport Spring Kits | Seadoo, Yamaha | Pro Valve Racing – PRO VALVE RACING PRODUCTS

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Valve spring and retainer kits for Seadoo and Yamaha jet ski platforms. System-matched components for sustained high-RPM operation on the water.

Pro Valve Racing Yamaha GP1800/FZR/FZS/FX Single Spring/Retainer

SALE

Yamaha GP1800/FZR/FZS/FX Single Spring/Retainer Kit

$687.00

$589.00

Pro Valve Racing takes a scientific "System" approach when designing our Valve spring kits. Each component is designed to work with the others as part of the complete system. Pro Valve Racing's eng...

Pro Valve Racing Yamaha GP1800/FZR/FZS/FX Single Spring/Retainer

Yamaha GP1800/FZR/FZS/FX Dual Spring/Retainer Kit

$689.00

Pro Valve Racing takes a scientific “System” approach when designing our Valve spring kits. Each component is designed to work with the others as part of the complete system. Pro Valve Racing's eng...

Pro Valve Racing Seadoo RXP/RXT Spring/Ti-Retainer Kit

SALE

Seadoo RXP/RXT Spring/Ti-Retainer Kit

$499.00

$479.00

Pro Valve Racing takes a scientific “System” approach when designing our Valve spring kits. Each component is designed to work with the others as part of the complete system.Pro Valve Racing's engi...

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PRO Intake and exhaust valve tech info

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Material	Stem Diameter	Overall Length	Tip Length	Groove Type	Seat Angle

Head Diameter: The diameter of the valve head, measured across the widest point of the disc that seals against the valve seat. This is the primary sizing spec for matching a valve to your cylinder head's port and seat.

Stem Diameter: The diameter of the valve stem, the shaft that rides in the valve guide. Common sizes are 5/16", 8mm, and 7mm. Stem diameter must match your guides, locks, and seals.

Overall Length (OAL):The total length of the valve from the tip to the edge of the head. OAL determines spring installed height and rocker arm geometry, so it needs to match your cam and valvetrain setup.

Tip Length:The length of the machined tip surface at the top of the stem, where the rocker arm or lifter makes contact. Tip length affects wear patterns and geometry under valve lift.

Groove Type:The style of lock groove machined into the valve stem, which determines which valve locks (keepers) will fit. Single-groove and multi-groove designs are not interchangeable.

Seat Angle:The angle of the valve face that contacts the seat, typically 30° or 45°. Seat angle must match your cylinder head's seat cut for a proper seal.