Detailed Photos
Installation Instructions
Product Description
346-03200-1/2
Carburetor Assy, Tohatsu,
For Outboard: Tohatsu M25C2
Features:
| 1. Precision Fuel Delivery: The carburetor ensures that the engine receives the right amount of fuel and air mixture at various RPMs, from idle to full throttle. |
| 2. Multiple Jets: It contains different jets (idle, main, and pilot jets) that control the fuel flow at various engine speeds, ensuring optimal combustion efficiency. |
| 3. Choke Mechanism: Many carburetors are equipped with a choke mechanism, which helps during cold starts by delivering a richer fuel mixture. |
| 4. Throttle Valve: The carburetor's throttle valve regulates the amount of air entering the engine, thereby controlling engine speed. |
| 5. Float Chamber: It contains a float and a float valve that regulate the fuel level within the carburetor, ensuring consistent fuel delivery to the jets. |
Functions:
| 1. Air-Fuel Mixture Regulation: The primary function of the carburetor assembly is to mix air and fuel in the right proportion for combustion. It adjusts the ratio depending on the engine's demand, whether at idle, acceleration, or high speed. |
| 2. Smooth Idle Operation: The carburetor controls the air-fuel mixture at idle, ensuring the engine runs smoothly without stalling or hesitation. |
| 3. Optimal Throttle Response: The carburetor manages the amount of air and fuel entering the engine based on throttle input, providing smooth acceleration and deceleration. |
| 4. Fuel Efficiency: By ensuring the correct mixture of air and fuel, the carburetor helps optimize fuel consumption, reducing waste and improving overall fuel efficiency. |
| 5. Cold Start Aid: With a choke or primer system, the carburetor helps richen the fuel mixture during cold starts, making it easier to start the engine in cooler temperatures. |
Size:
| 1. Varies by Engine Model: The size of the carburetor assembly varies depending on the engine's displacement and design. Larger engines may require more substantial carburetors with larger jets to handle the increased air and fuel flow. |
| 2. Custom Fit: Each carburetor assembly is specifically designed to fit a particular Mercury outboard model, ensuring proper integration with the engine. |
Maintenance Tips:
| 1. Regular Cleaning: Over time, dirt, varnish, and fuel deposits can clog the jets and passages inside the carburetor. It is crucial to clean the carburetor periodically using carburetor cleaner to maintain proper performance. |
| 2. Inspect and Replace Worn Parts: Regularly check components such as gaskets, O-rings, and the float valve for wear and replace them if necessary. Damaged parts can lead to fuel leaks or improper fuel flow. |
| 3. Adjust the Air-Fuel Mixture: If the engine is running too lean (not enough fuel) or too rich (too much fuel), adjust the carburetor's pilot screw or idle mixture screw according to the engine's manual. |
| 4. Check for Air Leaks: Inspect the carburetor body and connections for air leaks, which can affect the air-fuel mixture and cause poor engine performance. |
| 5. Float Level Adjustment: Ensure that the float height is set correctly. An incorrect float level can cause fuel starvation or flooding, affecting engine performance. |
| 6. Use Fresh Fuel: Stale fuel can cause the carburetor to become gummed up with deposits, leading to poor performance. Always use fresh, high-quality fuel to avoid fuel-related issues. |
| 7. Seasonal Maintenance: Before storing your outboard motor for extended periods, consider draining the carburetor to prevent fuel from sitting and causing varnish buildup. Alternatively, use a fuel stabilizer to prevent fuel degradation. |
Common Signs of Issues and Symptoms:
| 1. Rough Idling or Stalling: If the carburetor is dirty or improperly adjusted, the engine may run rough at idle or stall frequently. |
| 2. Hard Starting: A clogged or poorly functioning carburetor can make the engine difficult to start, especially after periods of inactivity. |
| 3. Fuel Leaks: Worn gaskets or a damaged float valve can cause fuel to leak from the carburetor. |
| 4. Poor Fuel Economy: An improperly adjusted or malfunctioning carburetor may cause the engine to run rich, consuming more fuel than necessary. |
| 5. Hesitation or Poor Throttle Response: A lean air-fuel mixture caused by clogged jets or an air leak can result in sluggish acceleration or poor throttle response. |
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