| Specification | Detail |
|---|---|
| Production Years | 2012 – 2017 |
| Engine Oil | SAE 10W-40 (JASO MA) | 2.1L – 2.7L |
| Tires (F/R) | 110/80-17 / 140/70-17 |
| Spark Plug | NGK CPR7EA-9 (0.8–0.9 mm gap) |
| Battery | YTX9-BS |
While most 250cc motorcycles of its era chased high-RPM performance and lightweight frames, the Suzuki Inazuma 250 (GW250) was engineered with a unique philosophy: it was built to mimic the visual mass and presence of the legendary B-King (GSX1300BK). Historically, the Inazuma—which translates to ‘Lightning’ in Japanese—utilized a rare long-stroke engine design (53.5 mm x 55.2 mm) specifically to prioritize low-to-mid-range torque, making it one of the most tractable and beginner-friendly parallel twins ever produced.
Engineering Overview
The Inazuma 250 features a liquid-cooled, SOHC parallel-twin engine. Unlike the high-revving Ninja 250R or CBR250R, the GW250 focuses on ‘real-world’ usability. Its engine includes a coupling-type balancer shaft to significantly reduce vibrations, providing a riding experience usually reserved for larger displacement machines. The ‘F’ variant introduced a full fairing for improved wind protection, catering to the light-touring market.
Maintenance Specifications
1. Lubrication System
To maintain the longevity of the long-stroke twin, using high-quality oil is critical. The engine requires SAE 10W-40 meeting API SF/SG/SH/SJ/SL/SM standards with a JASO MA rating to ensure wet-clutch compatibility.
- Oil Change: 2.1 Liters
- With Filter Change: 2.4 Liters
- Engine Overhaul: 2.7 Liters
2. Wheels and Tires
The Inazuma’s handling is characterized by stability rather than flickability, thanks to its generous wheelbase and tire dimensions.
- Front: 110/80-17 M/C 57H (Pressure: 2.0 bar / 29 psi)
- Rear: 140/70-17 M/C 66H (Pressure: 2.25 bar / 33 psi Solo; 2.5 bar / 36 psi Dual)
3. Electrical and Ignition
Reliability is a hallmark of the GW250 platform. It utilizes a standard YTX9-BS battery. For the ignition system, the NGK CPR7EA-9 is the specified spark plug. It is essential to verify the electrode gap is between 0.8–0.9 mm to ensure optimal combustion efficiency and prevent cold-start issues.
MotoSpecsLab Verdict
The Suzuki Inazuma 250 remains a ‘hidden gem’ for riders who value build quality and comfort over outright speed. Its robust steel cradle frame and ‘big bike’ ergonomics make it an excellent commuter. Provided the maintenance schedule—particularly the specific oil volumes—is strictly followed, the GW250 engine is known to exceed 100,000 kilometers with minimal mechanical degradation.