Suzuki GS400 Parts | 1976–1986 OEM and Aftermarket Parts

Looking for high-quality Suzuki GS400 parts? This collection is dedicated to keeping one of Suzuki’s most important early four-stroke motorcycles on the road, whether you’re restoring a period-correct classic or maintaining a dependable vintage rider.

Introduced in 1976, the Suzuki GS400 marked a major turning point for Suzuki, becoming one of the company’s first modern four-stroke motorcycles since the Colleda models of the 1950s. Released alongside the GS550 and GS750, the GS400 shared a common design language and engineering philosophy while offering a lighter, more approachable platform.

Powered by a cross-mounted air-cooled parallel-twin engine, the GS400 featured double overhead camshafts, two valves per cylinder, and a six-speed transmission — setting it apart from its larger four-cylinder siblings, which used five-speed gearboxes. The GS400 was equipped with a rear drum brake, while the GS550 and GS750 featured disc brakes front and rear. Like other GS models, the GS400 came well equipped for its time with electric start, fuel gauge, gear position indicator, a tubular double-cradle frame, and compliant suspension that made it both practical and enjoyable to ride.

Produced through 1986, the GS400 earned a reputation for reliability, smooth power delivery, and everyday usability. Today, it’s respected as a classic mid-size Japanese twin and a solid foundation for restorations and traditional custom builds.

Quality GS400 Parts for Restoration & Maintenance

At Old Bike Barn, we specialize in hard-to-find Suzuki GS400 replacement parts to keep these early GS-series motorcycles running strong. Whether you're performing routine maintenance, reviving a long-stored bike, or restoring a clean original, this collection provides the parts you need to do the job right.

This collection 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 components, and other essential wear items commonly required on 1976–1986 GS400 models.

All parts are curated specifically for Suzuki GS400 motorcycles, ensuring accurate fitment and dependable performance. As original factory components become increasingly scarce, we focus on keeping critical maintenance and restoration parts available so these bikes can remain reliable riders.

Why Choose Old Bike Barn?

Hard-to-find OEM and aftermarket parts, accurate year-specific fitment, inventory curated by riders who wrench, and friendly support from vintage motorcycle specialists — that’s why builders trust Old Bike Barn for Suzuki GS400 motorcycle parts. We help keep classic Japanese twins alive, one project at a time.