KIBBLEWHITE valve spring kit intake for YAMAHA YZ 250 FX, YZ 450 F, YZ 450 FX from 2014 to 2017

KIBBLEWHITE offers this valve spring kit intake for YAMAHA YZ 250 FX, YZ 450 F, YZ 450 FX from 2014 to 2017. The camshaft opens the valves and the springs close them. At high revs the spring must bring the valve back very quickly: if it is tired, the valve can no longer keep up and “floats”.

Why replace the valve springs?

The benefits:

• Safe running at high revs again.
• Essential with a hotter camshaft or steel valves, which are heavier than titanium.
• Quality steel springs keep their strength longer.

Why choose KIBBLEWHITE?

Kibblewhite chrome-silicon steel springs prevent valve float at high revs.

When should you replace the valve springs on your YAMAHA YZ 450 F?

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

Specifications and fitting tips

• Contents: 2 x Intake Valves, 2 x Basewashers, 2 x Valve Springs, 2 x Titanium Retainers
• Valve face angle: 20°
• Application: Intake
• Head diameter: 1.457"
• Stem diameter: 0.2158"
• Installed height: 1.185"
• Extends valve train and intake component life up to 4 times over the OEM titanium parts

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

Compatibility

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

Fits:
YAMAHA YZ 250 FX 2017
YAMAHA YZ 250 FX 2016
YAMAHA YZ 250 FX 2015
YAMAHA YZ 450 F 2017
YAMAHA YZ 450 F 2016
YAMAHA YZ 450 F 2015
YAMAHA YZ 450 F 2014
YAMAHA YZ 450 FX 2017
YAMAHA YZ 450 FX 2016