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PISTON SET FZ 25
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Yamaha FZ 25
The piston set for the Yamaha FZ 25 (and FZS 25) is a robust assembly specifically designed for its $249.07 \text{ cc}$ Single Cylinder, 2-Valve, SOHC, Air/Oil-Cooled, Fuel-Injected engine. This engine employs Yamaha's Blue Core technology for a balance of performance and efficiency. The piston is cast from a high-strength, lightweight aluminum alloy to manage the thermal and mechanical loads from the engine's quarter-litre displacement.
Key to the engine's design is its over-square configuration, defined by a large $74.0 \text{ mm}$ bore and a shorter $58.0 \text{ mm}$ stroke, which the piston is precisely matched to. This configuration typically favors high-revving performance, although the FZ 25 is tuned for strong mid-range torque. The piston maintains a consistent $9.8:1$ compression ratio (some variants list $9.5:1$ or $9.6:1$). The complete piston set ensures optimal combustion sealing and oil control and includes the piston, a full set of piston rings, the piston pin (gudgeon pin), and the circlips.
Specification:
Engine Compatibility: Yamaha FZ 25 and FZS 25 (BS4/BS6 compliant models)
Engine Displacement: 9$249.07 \text{ cc}$
Engine Technology: 4-Stroke, Single Cylinder, 2-Valve, SOHC, Air/Oil-Cooled, FI10
Piston Material: High-Grade Aluminum Alloy (Lightweight for reduced inertia)
Piston Diameter (Bore Size): Standard size: 11$74.0 \text{ mm}$
Engine Stroke Length: 12$58.0 \text{ mm}$ (Engine specification)13
Compression Ratio: 14$9.8:1$ (Commonly listed)15
Piston Pin Diameter (Gudgeon Pin): The specific diameter is typically $16 \text{ mm}$ (Common size for this displacement, but confirmation is advised).
Piston Set Components: Piston, Piston Rings (complete set), Piston Pin, Circlips (2 Nos.)
Specification:
Engine Compatibility: Yamaha FZ 25 and FZS 25 (BS4/BS6 compliant models)
Engine Displacement: 9$249.07 \text{ cc}$
Engine Technology: 4-Stroke, Single Cylinder, 2-Valve, SOHC, Air/Oil-Cooled, FI10
Piston Material: High-Grade Aluminum Alloy (Lightweight for reduced inertia)
Piston Diameter (Bore Size): Standard size: 11$74.0 \text{ mm}$
Engine Stroke Length: 12$58.0 \text{ mm}$ (Engine specification)13
Compression Ratio: 14$9.8:1$ (Commonly listed)15
Piston Pin Diameter (Gudgeon Pin): The specific diameter is typically $16 \text{ mm}$ (Common size for this displacement, but confirmation is advised).
Piston Set Components: Piston, Piston Rings (complete set), Piston Pin, Circlips (2 Nos.)
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