
Premium Outboard Carburetor Assembly 3303-853720A 8 | Marine Grade Engine Parts
Part Number: 3303-853720A 8 / 3303-853720A8 Component Type: Complete Carburetor Assembly (CARBURETOR ASSY) Origin: Product of Japan (Premium craftsmanship and strict tolerance control) Primary Application: Designed for Mercury / Mariner marine outboard engines (specifically widely utilized on 25HP / 30HP series architectures). Cross-references may apply to selected regional brand configurations matching this Japanese-engineered platform.
1. Technical Specifications
- Part Number: 3303-853720A 8 / 3303-853720A8
- Component Type: Complete Carburetor Assembly (CARBURETOR ASSY)
- Origin: Product of Japan (Premium craftsmanship and strict tolerance control)
- Primary Application: Designed for Mercury / Mariner marine outboard engines (specifically widely utilized on 25HP / 30HP series architectures). Cross-references may apply to selected regional brand configurations matching this Japanese-engineered platform.
2. High-End Engineering & Performance Advantages
- Precision Fuel-Air Mixing: Features micro-machined internal jets and calibrated throttle butterflies, ensuring an optimal stoichiometric ratio across all RPM ranges. This eliminates hesitation during sudden acceleration.
- Superior Marine-Grade Corrosion Resistance: The main body casting is treated with an advanced anti-oxidation and salt-spray protective barrier, significantly reducing internal fuel varnish build-up and external pitting from humid sea air.
- Heavy-Duty Rebound Springs: Equipped with premium stainless steel throttle return springs (visible in
suzuki 25hp.jpg) that maintain consistent tension and prevent sticking, ensuring precise control and operator safety.
- 100% Factory Flow Tested: Every unit undergoes wet-testing and flow calibration at the factory to guarantee "bolt-on-and-go" performance straight out of the box, drastically cutting down installation time for repair mechanics.


