VERTEX Steel Exhaust Valve for HM CREF 450 and HONDA CRF 450 2007-2008

VERTEX offers this exhaust valve for HM CREF 450 and HONDA CRF 450 2007-2008. A four-stroke engine breathes through its valves. The exhaust valves open to let the burnt gases out to the pipe, then close again.

Titanium, steel or stainless valve?

This valve is steel.

• Titanium: about 40 % lighter than steel, it lets the engine rev high without valve float; standard on most modern 4-stroke motocross bikes. On the downside, it costs more and its coating wears faster if seats and guides are tired.
• Steel or stainless: heavier but very wear-resistant and cheaper; as a titanium replacement it lasts longer, with springs suited to its weight.
• Tip: replace valves as a set, have the seats checked and fit new valve stem seals.

Why choose VERTEX?

Vertex has manufactured in Italy since 1953 and has supplied KTM’s original pistons since 1996 (KTM, Husqvarna, GASGAS), with ISO 9001-certified production.

When should you replace the valves?

Hard hot starting, valve clearance that keeps closing up or a noisy timing chain: the valve train is wearing.

Specifications and fitting tips

• Manufacturer part number: 8400002-5

Cross-Mania tip: Check the guides and seats before reassembly and lap the valves in. Titanium valves must not be fitted on worn seats.

Also needed with this part

• Valve stem seals : PROX · CENTAURO
• Valve shims : PROX · HOT CAMS
• Top-end gasket kit : PROX · ITALKIT
• 4-stroke engine oil : LIQUI MOLY 10W40 1 L · MOTUL 10W50

Compatibility

Check the exact model and year of your bike in the list below before ordering.

Fits:
HM CREF 450 2008
HM CREF 450 2007
HONDA CRF 450 2008
HONDA CRF 450 2007