Home/HONDA, KIBBLEWHITE, POWERSPORTS HEADS SERVICE KIT, STEEL VALVE CONVERSION KITS/Cylinder Head Service Kit, 0.440″ In and 0.405″ Ex Lift, Honda®, CRF™ 450R / RX / WE, 2017-2020 # 30-33330

Cylinder Head Service Kit, 0.440″ In and 0.405″ Ex Lift, Honda®, CRF™ 450R / RX / WE, 2017-2020 # 30-33330


1 in stock (can be backordered)


CRF450R/RX/WE 2017-20


1 in stock (can be backordered)


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 Valve Spring Kit, Which Allows for 0.440″ In. and 0.405″ Ex. Valve Lift
• Top End Gasket Kit by Cometic
• KPMI® C630 Bronze Standard Valve Guides
• KPMI® S.S. and Inconel® White 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 1.340″
Intake Seat Pressure 50#
Intake Open Pressure 162#
Intake @ Lift 0.440″
Exhaust Valve Lift 0.405″
Exhaust Installed Height 1.360″
Exhaust Seat Pressure 90#
Exhaust Open Pressure 220#
Exhaust @ Lift 0.405″
Valve Type Intake / Exhaust
Valve Material Intake- White Diamond® Stainless
Exhaust- White Diamond® Inconel®
Coating Hard Chrome
Intake Head Diameter 38.00mm / 1.496″
Intake Stem Diameter 0.1960″
Intake Tulip 20º
Intake Overall Length 3.080″
Exhaust Head Diameter 31.00mm / 1.220″
Exhaust Stem Diameter 0.1955″
Exhaust Tulip 23º
Exhaust Overall Length 3.165″
Remarks Standard
Guide Type Intake / Exhaust
Guide Material C630 Bronze
Reference See Figure 1
Intake Outside Dia.: (G) 0.4360″ / Std.
Intake (A) 0.535″
Intake (B) 0.535″
Intake (C) 0.590″
Intake (D) 0.670″
Intake (E) 0.433″
Intake (F) 0.1960″
Exhaust Outside Dia.: (G) 0.4360″ / Std.
Exhaust (A) 0.630″
Exhaust (B) 0.630″
Exhaust (C) 0.730″
Exhaust (D) 0.870″
Exhaust (E) 0.433″
Exhaust (F) 0.1955″


Additional information

Weight 1.5 kg
Dimensions 25 × 25 × 8 cm


There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.


Go to Top