Kawasaki KZ550 Parts (1980–1984) – OEM & Aftermarket Motorcycle Parts

Looking for high-quality Kawasaki KZ550 parts? Whether you ride a standard KZ550 or the high-performance GPz550, this collection includes the essential components you need to restore, maintain, or keep one of Kawasaki’s most competitive middleweight motorcycles on the road.

Introduced in 1980, the Kawasaki KZ550 platform was elevated to new performance levels with the development of the GPz550, created during a period when Kawasaki was dominating Grand Prix racing. While retaining the 553cc air-cooled inline-four engine, the GPz550 featured higher compression, more aggressive camshaft profiles, and sport-focused tuning that transformed it into the fastest bike in its class.

Early models such as the KZ550D GPz used upgraded carburetion with larger main jets, while later versions including the KZ550H and ZX550A adopted CV carburetors and further refinements. The GPz550 quickly earned a reputation as the undisputed king of the 550cc class, capable of quarter-mile times in the mid-12-second range — performance that rivaled much larger motorcycles. In 1982, Kawasaki introduced a monoshock rear suspension, and by 1984, revised valve timing and ignition pushed output to approximately 68 horsepower, along with updated bodywork and a larger fairing.

Quality KZ550 & GPz550 Parts – Built for Restorations & Performance Builds

At Old Bike Barn, we specialize in hard-to-find Kawasaki KZ550 and GPz550 replacement parts to keep these legendary middleweights running strong. Whether you’re restoring a stock KZ550, maintaining a race-inspired GPz550, or keeping a well-sorted rider dialed in, this collection provides the parts you need to do it right.

This page includes: engine gasket sets and seal kits, carburetor rebuild kits and fuel system components, fork seals and suspension parts, throttle, clutch, and brake cables, OEM-style levers, grips, and control hardware, front and rear brake pads and hardware, and other essential service items commonly required on aging KZ550 models.

All parts are curated specifically for Kawasaki KZ550 and GPz550 motorcycles, ensuring proper fitment and dependable performance across different model years and trims. As factory parts become increasingly scarce, we focus on keeping critical maintenance and replacement components available for restorers and riders alike.

Why Choose Old Bike Barn?

Hard-to-find OEM and aftermarket parts, accurate model-specific fitment, inventory curated by riders who wrench, and friendly support from vintage motorcycle specialists — that’s why riders trust Old Bike Barn for Kawasaki KZ550 motorcycle parts. We help keep classic Japanese performance machines alive.