Cylinder Head Service Kit, 0.440″ Lift, Honda®, CRF™ 450X, 2005-2017 # 30-33450


Available on back-order


CRF450X 2007-17


Available on back-order


KPMI® is proud to introduce full CYLINDER HEAD SERVICE KITS. These kits contain all items to completely refresh and upgrade cylinder heads for popular Dirt / MX and Side x Side models with KPMI’s top quality racing valvetrain components.


• Save time money on your next cylinder head rebuild
• One package, everything you need for factory recommended valvetrain service
• Double your service life over OEM using KPMI® Valvetrain products
• Kitted with value added savings

Kit Includes:
• Dual Spring Titanium Retainer Spring Kit, Which Allows for 0.440″ Valve Lift
• Top End Gasket Kit by Cometic
• KPMI® C674 Bronze Standard Valve Guides
• KPMI® S.S. Black Diamond™ Valves, Stock Head Dia.

The product image may not be accurate on the page. Please refer to the description and specifications before purchasing.

Installation Instructions Click Here
Type Intake / Exhaust
Retainer Material Titanium
Intake Valve Lift 0.440″
Intake Installed Height 1.215″
Intake Seat Pressure 40#
Intake Open Pressure 147#
Intake @ Lift 0.440″
Exhaust Valve Lift 0.440″
Exhaust Installed Height 1.365″
Exhaust Seat Pressure 70#
Exhaust Open Pressure 203#
Exhaust @ Lift 0.440″
Valve Type Intake / Exhaust
Valve Material Black Diamond™ Stainless
Coating Black Nitroneg
Intake Head Diameter 35.00mm / 1.378″
Intake Stem Diameter 0.2158″
Intake Tulip 20º
Intake Overall Length 3.315″
Exhaust Head Diameter 30.00mm / 1.181″
Exhaust Stem Diameter 0.1957″
Exhaust Tulip 20º
Exhaust Overall Length 3.310″
Remarks Standard
Guide Type Intake / Exhaust
Guide Material C674 Bronze
Reference See Figure 1
Intake Outside Dia.: (G) 0.4360″ / Std.
Intake (A) 0.495″
Intake (B) 0.520″
Intake (C) 0.650″
Intake (D) 0.760″
Intake (E) 0.480″
Intake (F) 0.2155″
Exhaust Outside Dia.: (G) 0.4360″ / Std.
Exhaust (A) 0.580″
Exhaust (B) 0.605″
Exhaust (C) 0.740″
Exhaust (D) 0.890″
Exhaust (E) 0.480″
Exhaust (F) 0.1955″

Additional information

Weight 1.5 kg
Dimensions 25 × 25 × 8 cm


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