These engine plugs are actually stronger, lighter, and less prone to stripping than the stock units. But most importantly, they make it obvious how serious you are about racing.

Replacement Low-Volume Insert Kit for RS-4D silencers. Non-Spark Arrested. Available as optional kit on applications requiring different sound restrictions. Decibel reduction depends on application.

The Yoshimura Japan Racing Oil Filler Cap is exactly the same design, material and colour as used by the top Yoshimura devopment race teams.

• CNC Machined from high quality aluminium.
• Pre-drilled for lockwire.
• Hard anodised for lasting finish in a range of colours.
• Laser-etched logos.
• Optional Lockwire Braket Set (229-0WB-1000) available separately.

Replacement Low-Volume Insert Kit for RS-4 silencers. Non-Spark Arrested. Available as optional kit on applications requiring different sound restrictions. Decibel reduction depends on application.

Anyone who has tried to adjust their chain with OEM style axle adjuster blocks knows the frustration of dealing with sub-par quality. These Yoshimura units are lighter weight, more accurate, stronger than the factory blocks, and look great too!

This kit contains the correct end cap(s), rivets and stickers/decals for replacing the end cap on your bike.

Yoshimura R&D has developed the RS4 for Off-Road Bikes a design that provides an unrivalled combination of power and a quiet exhaust note. The RS4 features a Pentagonal aluminium silencer sleeve with a carbon fibre end-cap and a two staged baffle.

Yoshimura R&D has developed the RS4 for Off-Road Bikes a design that provides an unrivalled combination of power and a quiet exhaust note. The RS4 features a Pentagonal aluminium silencer sleeve with a carbon fibre end-cap and a two staged baffle.