kibblewhite, Top End Service Kit, Stainless Conv., 0.395″ Lift, Yamaha®, WR™ / YZ™ 250F, 2014-2016


Available on back-order


YZ250F 14-16



PISTON (77mm)

Available on back-order


Installation Instructions Click Here
Piston Bore Size 77.00mm
Type Intake / Exhaust
Retainer Material Titanium
Intake Valve Lift 0.395″
Intake Installed Height 1.150″
Intake Seat Pressure 55#
Intake Open Pressure 151#
Intake @ Lift 0.395″
Exhaust Valve Lift 0.370″
Exhaust Installed Height 1.100″
Exhaust Seat Pressure 46#
Exhaust Open Pressure 119#
Exhaust @ Lift 0.370″
Valve Type Intake / Exhaust
Valve Material Black Diamond™ Stainless
Coating Black Nitroneg
Intake Head Diameter 31.00mm / 1.220″
Intake Stem Diameter 0.1962″
Intake Tulip 18º
Intake Overall Length 3.265″
Exhaust Head Diameter 25.00mm / 0.984″
Exhaust Stem Diameter 0.1760″
Exhaust Tulip 30º
Exhaust Overall Length 3.240″
Remarks Standard

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Additional information

Weight 1.5 kg
Dimensions 25 × 25 × 8 cm


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