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CRF300L Big Bore

CRF300L performance cylinder head mods cams and valves

CRF300L performance cylinder head mods cams and valves

CRF300L Big Bore

Valvetrain Upgrades

4.5 (1,234)

Sold 100+ last 30 days

20% off first order

$95.00

Color

Black

Quantity

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OEM Honda or Black Diamond intake and exhaust valves: Choose between factory or lightweight, coated aftermarket options for tailored performance
Kibblewhite springs with titanium retainers: Reduces reciprocating mass by 64 grams for increased engine responsiveness
CBR300R camshafts: Drop-in upgrade for improved lift and horsepower without sacrificing midrange torque
CNC-machined or ground surfaces: Ensures high-quality, precise valve operation
Complete set with replacement Kibblewhite viton valve seals: Provides a full, ready-to-install upgrade

Summarized by Shop

4.9

7 ratings

5

4

3

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1

New Zealand Happy Customer

Hamish · August 24, 2026

Great Product

Really lets the motor rev up! Well worth it.

Philip · June 2, 2026

CRF300L BIG BORE kit/ Light weight valve train package

So I bought the BIG BORE kit along with the CNC ported and light weight vales and light weight springs and retainers. I have built plenty of hot rods in days gone by and a light weight valve train package is always on the list of parts to get. The weight savings helps the engine rev quicker and decelerate faster which is great for all types of riding and racing. Along with less punishment that the valve seats receive. It all adds up to a engine that will run better and last longer. Both plusses in my book.

Neal · January 17, 2026

CRF300L Big Bore

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