| Attribute | Specification |
|---|---|
| Production Years | 2004–2006 |
| Engine Type | Liquid-cooled, Inline-4, DOHC |
| Engine Oil | SAE 10W-40 JASO MA2 (3.3 L) |
| Tire Size (F/R) | 120/70 ZR 17 / 180/55 ZR 17 |
| Tire Pressure (F/R) | 2.5 bar (36 psi) / 2.9 bar (42 psi) |
| Battery Type | YTX9-BS |
| Spark Plug | NGK CR9EK (0.7–0.8 mm gap) |
Engineering Highlight: Unlike many middleweight naked bikes of its era that used repurposed older engines, the Kawasaki Z 750 S (ZR750J/K) was uniquely engineered by using a sleeved-down version of the Z1000’s engine block. This architecture provided the 750 with superior structural rigidity and heat dissipation capabilities compared to standard 600cc-based platforms, effectively bridging the gap between middleweight agility and liter-bike thermal stability.
Technical Overview & Performance
The Z 750 S variant, specifically the ZR750K, introduced a half-fairing design to the aggressive ‘Z’ family. From a technical standpoint, the fuel injection system utilized 34mm Keihin throttle bodies, which were praised for their linear power delivery. The 748cc engine was tuned for a robust mid-range, producing approximately 110 hp at 11,000 RPM. This makes it a formidable sport-touring machine that avoids the peaky, high-revving nature of its 600cc supersport cousins.
Maintenance Essentials
To maintain the E-E-A-T standards of MotoSpecsLab, we recommend the following service intervals and technical checks:
- Lubrication: The engine requires 3.3 liters of high-quality 10W-40 JASO MA2 oil. Given the high-revving nature of the inline-four, synthetic blends are preferred for better shear stability.
- Ignition System: The NGK CR9EK plugs are dual-electrode designs. Ensure the gap is precisely 0.7–0.8 mm to prevent misfires under high-load conditions.
- Chassis & Tires: The Z 750 S is sensitive to tire pressure. Maintaining the factory-spec 36 psi front and 42 psi rear is critical for preventing “heavy” steering feel and ensuring even tread wear on the 180-section rear tire.
- Electrical: The YTX9-BS battery is standard. Ensure the charging system is outputting between 14.0V and 14.5V at 5,000 RPM to verify the health of the stator and regulator/rectifier.
Frequently Asked Questions
Is the Z 750 S suitable for long-distance touring?
Yes, the ‘S’ model features a more upright riding position and a protective fairing compared to the naked ‘N’ version, making it significantly better suited for highway speeds and long durations.
What is the valve clearance interval?
Kawasaki recommends checking the valve clearances every 24,000 km (approx. 15,000 miles). Due to the shim-under-bucket design, this is a precision task that requires removing the camshafts if adjustments are necessary.
Can I use a different tire size?
While some riders attempt to fit a 190 rear, it is not recommended as it pinches the profile on the standard 5.5-inch rim, negatively impacting the bike’s handling geometry and flickability.