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'75 - '91 XR75, XR80, XR100, XL75, XL80, XL100S

Sized perfectly for adult back-yard racing or fast/aggressive mini riders. This is the most important upgrade you can make for an adult sized rider. The stock suspension is too soft for most adults and aggressive kids. Fits stock shock.

• 30% stiffer than stock
• Preset and stress relieved for long life
• Custom wound from aircraft quality spring steel
• Powder coated finish

Sized perfectly for adult back-yard racing or fast/aggressive mini riders. This is the most important upgrade you can make for an adult sized rider. The stock suspension is too soft for most adults and aggressive kids.

• 30% stiffer than stock
• Preset and stress relieved for long life
• Custom wound from aircraft quality spring steel

Fully wraps the chain to guide it onto the rear sprocket. Stainless steel hardware, anodized aluminum plate, and plastic buffer for low friction. Saves expensive engine cases.

Black hard anodized alloy sprocket. Machined sprockets made from 7075 T651 aluminum reduces distortion and provides optimal thickness, to extend sprocket and chain life.

ProCycle Rev Box increases the rev limit to 10,000 RPM. In addition, this unit offers a re-mapped timing curve which yields a noticeable increase to horsepower and torque over the stock CDI

This CDI box is a direct plug in replacement CDI. Simply locate and remove the stock CDI, and plug the unit directly into the wiring harness, no modification needed. Suitable for stock and modified machines

Complete big bore kit. Bolt it on and ride!

• Includes a pre-bored, big-finned aluminum cylinder for improved cooling
• Cylinder, rings, piston pin, & clips
• BBR exclusive performance camshaft
• Heavy-duty valve springs
• Rockers with tappet adjusters
• Gasket kit

Heavy duty springs help prevent clutch slip in high-performance motors.

• Custom wound from chrome-silicon wire
• Preset for long life
• Higher spring seat pressure to resist clutch slip

All of these options are for complete systems, including head pipe and muffler. The S option is for a Silencer only while the S/A is for a system with a Spark Arrestor.

The latest version of the Powercore 4 design incorporates a hi-flow core which mas more surface area to absorb more sound while flowing more exhaust. The silencer is constructed with an extruded aluminum canister is MIG/TIG welded and has space age internal packing. This system is lighter, stronger and provides more power than stock exhausts. The pipe is a stainless steel unit for strength and weight savings.

Powercore 4 S/A has a US Foresty approved, maintenance free, stainless steel spark arrestor screen to be sure you are safe and legal in the woods.