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4S1M Racing Throttle Body (34mm) for Yamaha Mio i 125 / M3
Unlock the true potential of your Yamaha Mio i 125 (M3) with the 4S1M 34mm Performance Throttle Body. Engineered by 4S1M (For Speed One Motor), this premium upgrade is designed to maximize air intake, drastically improving throttle response and delivering explosive power across the entire RPM range.
Whether you are running a modified daily commuter or a full-bore race setup, this 34mm throttle body eliminates the restrictive airflow of the stock unit, ensuring your fuel injection system gets the oxygen it needs to perform at its peak.
Key Features
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Massive Airflow Upgrade: The expanded 34mm bore delivers a significant volume of air to the combustion chamber compared to stock, resulting in a noticeable boost in horsepower and torque.
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Crisp Throttle Response: Eliminates engine lag and provides immediate, aggressive acceleration right when you twist the grip.
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Premium Build Quality: CNC-machined from high-grade, durable cast alloy to withstand high-vibration racing conditions and heat buildup.
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Perfect Fitment: Engineered specifically as a direct premium upgrade for the Yamaha Mio i 125 / Mio M3 / Fino 125i fuel-injected engines.
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Seamless Sensor Integration: Designed to easily accommodate your stock Throttle Position Sensor (TPS) and Idle Speed Control (ISC) for stable idling and tuning consistency.
Product Specifications
| Parameter | Detail |
| Brand | 4S1M (For Speed One Motor) |
| Product Type | High-Performance Throttle Body |
| Bore Size | 34mm |
| Compatible Model | Yamaha Mio i 125 / Mio M3 / GT 125 / Fino 125i |
| Material | High-Strength Cast Alloy / CNC Machined Components |
| Fuel System | Fuel Injection (FI) Only |
Why Upgrade to 4S1M?
Stock throttle bodies restrict your engine to prioritize quiet, conservative performance. When you upgrade your exhaust, bore up, or tweak your fuel management, the stock intake becomes a major bottleneck. The 4S1M 34mm Throttle Body feeds the engine efficiently, optimizing the air-fuel mixture to extract maximum performance from your upgrades.
💡 Mechanic’s Note: For optimum performance and a perfectly stable idle, ECU re-tuning or a fuel management adjustment is highly recommended after installation to perfectly match the increased airflow.





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