Yamaha YZ400 Parts (1977-1979) | Motocross
Shop Yamaha YZ400 parts for Motocross models with OEM and aftermarket options built around top-end rebuilds, clutch and brake service, suspension work, and race-bike upkeep. This collection is organized to help you find model-correct replacement parts faster, with clearer fitment for the Yamaha YZ400 bikes riders actually maintain, rebuild, and keep ready for the next moto.
The Yamaha YZ400 continued Yamaha’s big-bore motocross tradition with stronger open-class performance, competitive suspension, and unmistakable late-1970s race-bike character.
Frequently shopped Yamaha YZ400 parts for this collection include top-end parts, clutch parts, brake parts, suspension components, and ignition components. Accurate fitment matters because motocross bikes see hard use, and correct year-specific fitment matters for top-end parts, chassis hardware, suspension, and ignition components.
OEM & Aftermarket Yamaha YZ400 Parts for Motocross Rebuilds, Race Prep, and Repairs
At Old Bike Barn, Yamaha YZ400 owners can shop with clearer fitment, dependable OEM and aftermarket choices, and practical support for motocross rebuilds, race prep, and trackside repairs. This collection is built for racers, rebuilders, and long-time YZ owners who want to compare model-specific replacement parts with less guesswork.
This Yamaha YZ400 collection includes: engine gasket sets and seal kits, carburetor and intake parts, top-end service parts, clutch and brake parts, fork seals and suspension components, OEM-style levers, controls, cables, and hardware, chain and chassis service items, and ignition and electrical service components.
Parts in this Yamaha YZ400 collection are grouped where fitment applies, so it is easier to compare options before you order. Whether you need to freshen the top end, service clutch and brake components, rebuild suspension, or replace worn controls, the goal is the same: model-correct fitment, dependable operation, and a smoother path from parts search to finished repair.
Why Riders Choose Old Bike Barn for Yamaha YZ400 Parts
Old Bike Barn sources Yamaha YZ400 parts with a focus on year-and-model fitment, useful OEM and aftermarket coverage, and practical support for real-world motocross rebuilds, race prep, and trackside repairs. That makes it easier to shop with more confidence when you are trying to match the right components to the exact Yamaha YZ400 in your garage.
Building a Custom YZ400?
Some parts on a custom build are not model-specific. If you’re changing handlebars, mirrors, lighting, controls, shocks, exhaust pieces, fuel line, or hardware, visit our universal and custom motorcycle parts collection.
These parts are useful for cafe racers, brat builds, trackers, choppers, and garage-built vintage motorcycles, but they are not guaranteed to fit every bike without checking. Always compare measurements, mounting style, clearance, and product notes before ordering.