Find used OEM parts for Yamaha Seca motorcycles at Sun Coast Cycle Sports. The Seca name identifies a family of sport-touring and standard motorcycles Yamaha produced under the XJ designation from 1981 through the early 1990s. Models include the XJ550 Seca (1981-1983), XJ650 Seca and Seca Turbo (1982-1983), XJ750 Seca (1981-1984), and XJ900 Seca (1983+). These inline-four machines were the sport-oriented siblings of the Maxim cruiser line, sharing engines and many mechanical components but differing in ergonomics and bodywork. All parts in our catalog are sourced from complete donor machines, inspected, and shipped with individual photos from our Odessa, Florida location.
Seca models and parts compatibility
| Model | Years | Engine | Notes |
|---|
| XJ550 Seca | 1981-1983 | 528cc air-cooled DOHC inline-4 | Chain drive (unlike shaft-drive Maxim siblings), 6-speed |
| XJ650 Seca | 1982-1983 | 653cc air-cooled DOHC inline-4 | Shaft drive, sport-touring ergonomics. Same engine as XJ650 Maxim |
| XJ650 Seca Turbo | 1982-1983 | 653cc turbocharged air-cooled inline-4 | Factory turbocharger, fuel injection. Featured in James Bond film |
| XJ750 Seca | 1981-1984 | 749cc air-cooled DOHC inline-4 | Shaft drive, sport-touring. Related to XJ750 Maxim platform |
| XJ900 Seca | 1983+ | 853cc air-cooled DOHC inline-4 | Shaft drive, developed from XJ750 platform with increased displacement |
Within each displacement, Seca and Maxim variants share the same engine, transmission, and many chassis components. The sport-touring Seca versions use different handlebars, seats, and bodywork compared to the cruiser-styled Maxim, but the mechanical underpinnings are shared. The XJ550 Seca is the exception: it uses chain drive and a six-speed gearbox rather than the shaft drive and five-speed found on larger XJ models. The XJ650 Seca Turbo is a specialized variant with a factory turbocharger and fuel injection that shares the basic XJ650 engine block but has unique intake, exhaust, and fuel system components. Within each specific model, parts interchange freely across all production years.
Common Seca failure points and replacement parts
Carburetor deterioration (naturally aspirated models): The banks of carburetors on non-turbo Seca models suffer from the same age-related issues as all vintage carbureted bikes: stuck floats, corroded jets, and hardened diaphragms. Complete carb rebuilds are standard when bringing any stored Seca back to running condition.
Turbo system maintenance (XJ650 Seca Turbo): The factory turbocharger system includes the turbo unit, wastegate, boost control, and fuel injection. Age-related turbo seal leaks, wastegate actuator failures, and fuel injection system faults are common on the rare surviving Turbo models. Replacement turbo-specific parts are extremely scarce.
Charging system failures: Stator and rectifier/regulator failures are common across all Seca models at this age. The XJ650 Seca Turbo's fuel injection system is particularly sensitive to charging system voltage.
Cam chain tensioner wear: The DOHC engines use cam chain tensioners that wear over time, producing a rattling noise at idle. Replacement is a routine service item on higher-mileage examples.
Commonly replaced Seca parts
- Carburetor rebuild kits and diaphragms (non-turbo models)
- Turbo unit, wastegate, and boost components (Turbo model)
- Stator, rectifier/regulator, and ignition components
- Cam chain tensioners
- Shaft drive U-joint and seals (shaft-drive models)
- Chain, sprockets (XJ550)
- Exhaust system and mufflers
- Fork seals and suspension components
- Brake pads, calipers, and master cylinders
Frequently asked questions
Q: Are Seca and Maxim parts interchangeable?
Within the same displacement, the Seca and Maxim share the same engine, transmission, and most mechanical components. The differences are in ergonomics and bodywork: handlebars, seats, footpeg positions, and cosmetic panels. Engine parts, electrical components, brakes, and drivetrain cross between the two variants.
Q: How rare is the XJ650 Seca Turbo?
The XJ650 Seca Turbo was produced for only two model years (1982-1983) in limited numbers. It was one of the first factory turbocharged motorcycles ever produced. Surviving examples are rare, and turbo-specific components (turbocharger, wastegate, fuel injection system) are extremely difficult to source. Non-turbo XJ650 engine parts can be used for the basic engine block.
Q: Does the XJ550 Seca use chain or shaft drive?
The XJ550 Seca uses chain final drive and a six-speed transmission, unlike the larger XJ650, XJ750, and XJ900 Seca models which all use shaft drive with five-speed transmissions. This makes the XJ550's drivetrain components unique within the Seca family.
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