Description
DEF Racing 2020-2022 Yamaha YZ450F high-performance +1.5mm oversize steel exhaust valves and +2.0mm oversize titanium intake valves. Motocross, Flat Track, Ice Racing and Drag Racing will all benefit with these valves improving mid to top end power.
Product Features:
- Exhaust Valves: Increased diameter of 32.0mm (+1.5mm larger than OEM) – Steel
- Intake Valves: Increased diameter size of 39.0mm (+2.0mm larger than OEM) – Titanium
- Requirements!
- Will require machine work to remove and reinstall larger intake valve seats
- OEM exhaust valve seat will need to be recut for larger +1.5mm valve
- Must use at least a 40.0mm intake valve seat
- Requires a piston with increased valve pocket diameters!
- Will require machine work to remove and reinstall larger intake valve seats
- Valve Stem Size: Remain OEM of 5.5mm
- Material: Manufactured in the USA with high-quality steel and titanium for exceptional strength and longevity
- Design: Proprietary tulip and margin shapes specifically designed to improve airflow, reduce reversion and turbulence
- Durability: Hours of testing and racing have proven to withstand the harshest conditions at the track
For the best results, we recommend using this valve kit with a properly ported head to fully unlock its potential.
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