| Component | Specification |
|---|---|
| Engine Type | 805cc, 45° V-Twin, Liquid-Cooled |
| Engine Oil | SAE 10W-40 (API SF/SG) – 2.4 Liters |
| Spark Plugs | NGK DPR8EA-9 |
| Front Tire | 110/80 V18 (2.25 bar / 33 psi) |
| Rear Tire | 140/80 V17 (2.50 bar / 36 psi) |
| Battery | YB16B-A |
| Final Drive | Shaft Drive |
A unique historical outlier in Suzuki’s catalog, the VX 800 (VS51B) was not born in Hamamatsu, but rather conceived at Suzuki’s U.S. design studio in Brea, California. Lead designer Sam Tanushige envisioned a motorcycle that bridged the gap between the torque-heavy character of an American cruiser and the agile, understated elegance of a European standard. This resulted in the adaptation of the Intruder 750 engine—bored out to 805cc—into a long-wheelbase, shaft-driven naked frame.
Technical Engineering Overview
The heart of the VX 800 is its 45-degree V-twin. Unlike the high-revving inline-fours of its era, the VS51B focuses on linear torque delivery and mechanical simplicity. The liquid-cooled SOHC engine utilizes four valves per cylinder and dual Mikuni carburetors. Its defining characteristic is the offset crankpins, which were designed to minimize vibration without the need for heavy balance shafts, preserving the raw V-twin pulse while maintaining touring comfort.
Maintenance & Fluid Requirements
For the professional technician or the dedicated owner, the VX 800 is a relatively accessible machine. The lubrication system requires 2.4 liters of SAE 10W-40 oil. Given the era of the engine design, an API SF or SG rating is specified; however, modern JASO MA2 synthetic blends are often used to ensure clutch compatibility and gearbox protection.
- Ignition: The dual-spark configuration utilizes NGK DPR8EA-9 plugs. Gap checks should be performed every 6,000 miles.
- Electrical: The YB16B-A battery provides the high cranking amps required for the large-displacement V-twin pistons.
- Final Drive: The shaft drive system is virtually maintenance-free compared to chains, but the gear oil should be inspected for moisture contamination periodically.
Chassis, Tires, and Handling
The VX 800 features a long 1555mm wheelbase, making it exceptionally stable at highway speeds. However, this geometry requires precise tire pressure management to maintain steering neutrality. The front 110/80 V18 should be set to 2.25 bar (33 psi), while the rear 140/80 V17 requires 2.50 bar (36 psi). Deviating from these pressures can lead to “heavy” low-speed handling, a common complaint among owners with under-inflated tires.
MotoSpecsLab Verdict
The Suzuki VX 800 VS51B/95 remains a sophisticated choice for riders who value longevity and character over outright horsepower. Its blend of low-maintenance shaft drive, a proven cruiser-derived engine, and classic roadster ergonomics makes it a cult classic. Provided the cooling system and carb synchronization are maintained, these machines are known to exceed 100,000 kilometers with ease.