Graves Motorsports Yamaha WR250R + WR250X Smog Block Off Kit

Description

Graves air-injection blanking plates for a closed-course racing conversion.

Specifications and features

• Seals the original air-injection ports at the valve cover.
• CNC-machined billet aluminium.
• Removing secondary-air injection avoids dilution of exhaust-gas readings during air/fuel-ratio tuning.

Fitment

• Yamaha WR250 X + R 2008-2017

Installation and use

• For closed-course competition only. Removes part of the original emissions-control system; not a road-use modification.
• Engine tuning may be required. Reduced overrun popping is not guaranteed.
• The supplier specifies this modification when using a Dynojet Power Commander Autotune system for the listed racing application.

Manufacturer part number: ABY-08WR2-S