A must-have item for any off-road motorcycle, stock or modified. You will benefit from increased clutch life with our high performance springs.12-15% stiffer than stockMore positive clutch engagementPrevents clutch slippingConsistent spring performance

The compact design of the R-304 Silencer offers optimum performance gains and is recommended for closed-course racing only. Hex head screws are used to secure the inlet cap and can be removed easily for quick re-packing of the silencer.

The compact design of the R-304 Silencer offers optimum performance gains and is recommended for closed-course racing only. Hex head screws are used to secure the inlet cap and can be removed easily for quick re-packing of the silencer.

Each water pump assembly has been CNC-machined from billet aluminum and is color anodized. The Pro Circuit Water Pump Impeller has been designed to increase the pumping capacity and pressure head to reduce cavitation and increase cooling system...

The 304 silencer is recommended for most two-stroke applications. The slightly longer body offers reduced noise output when compared to the R-304. The brushed aluminum body, stainless steel inlet tube and end-cap give you a silencer that looks as good as...

The original Pro Circuit Works pipe offers unparalled performance and power for every two-stroke application. Increased horsepower and torque gains will quickly be noticed across the entire rpm range. The unplated, oiled metal finish requires some...

Unparalleled performanceIncrease in horsepower and torque gains will be noticed across rpm rangeElectroless nickel plating increases part life 2-10x longerStamped AKDQ high quality carbon steelHand welded and pounded seams* requires Pro Circuit...

The 304 silencer is recommended for most two-stroke applications. The slightly longer body offers reduced noise output when compared to the R-304. The brushed aluminum body, stainless steel inlet tube and end-cap give you a silencer that looks as good as...

The original Pro Circuit Works pipe offers unparalled performance and power for every two-stroke application. Increased horsepower and torque gains will quickly be noticed across the entire rpm range. The unplated, oiled metal finish requires some...

Unparalleled performanceIncrease in horsepower and torque gains will be noticed across rpm rangeElectroless nickel plating increases part life 2-10x longerStamped AKDQ high quality carbon steelHand welded and pounded seams* requires Pro Circuit...

The Platinum 2 Pipe was made for people who ride or race off-road. Constructed from heavy-duty 18-gauge metal, it offers increased protection from rock or crash damage. Like the Platinum and Works pipe, the Platinum 2 offers incredible performance with...

Unparalleled performanceIncrease in horsepower and torque gains will be noticed across rpm rangeElectroless nickel plating increases part life 2-10x longerStamped AKDQ high quality carbon steelHand welded and pounded seams* requires Pro Circuit...

Pro Circuit's Linkage Arms are CNC-machined from billet aluminum and are designed to stiffen up the initial linkage curve and lower the chassis, making the bike much more stable. This will also help eliminate the initial loose and wallowy feel. Turning...

Not only does the 304 offer a great sound and reduced noise output with its longer silencer bodyAluminum and stainless steel construction also offers increased durability and performanceNot legal for use in California on pollution controlled vehicles,...

The original Pro Circuit Works pipe offers unparalled performance and power for every two-stroke application. Increased horsepower and torque gains will quickly be noticed across the entire rpm range. The unplated, oiled metal finish requires some...

The Ti-2 is similar to the popular R-304 Silencer except it is constructed with a Carbon Dupont™ Kevlar® shell, Titanium tubing and end caps. The Titanium and Carbon Dupont™ Kevlar® construction offers the “FACTORY” look and appearance while reducing...

PC-04 Assembly Lube is designed to prevent metal-to-metal contact upon engine start-up before adequate lubrication can be supplied. PC-04 is also excellent for use on bolt threads for accurate torque readings.

Just like our Ti-5 Titanium Exhaust System, the T-5 produces the same results except that the T-5 is constructed of stainless steel and aluminum for increased strength and durability. This system also includes our RC-4 Resonance Chamber to help reduce...

The original Pro Circuit Works pipe offers unparalled performance and power for every two-stroke application. Increased horsepower and torque gains will quickly be noticed across the entire rpm range. The unplated, oiled metal finish requires some...

The compact design of the R-304 Silencer offers optimum performance gains and is recommended for closed-course racing only. Hex head screws are used to secure the inlet cap and can be removed easily for quick re-packing of the silencer.

The compact design of the R-304 Silencer offers optimum performance gains and is recommended for closed-course racing only. Hex head screws are used to secure the inlet cap and can be removed easily for quick re-packing of the silencer.

The Type 296 Spark Arrestor is specially engineered with an internal metal baffle, chambers and sound absorbing materials for a muffled exhaust sound and no loss of motor performance. The desired sound level is at or near 96dB on most models.

The Ti-2 is similar to the popular R-304 Silencer except it is constructed with a Carbon Dupont™ Kevlar® shell, Titanium tubing and end caps. The Titanium and Carbon Dupont™ Kevlar® construction offers the “FACTORY” look and appearance while reducing...

The original Pro Circuit Works pipe offers unparalled performance and power for every two-stroke application. Increased horsepower and torque gains will quickly be noticed across the entire rpm range. The unplated, oiled metal finish requires some...