| Customization: | Available |
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| After-sales Service: | Yes |
| Warranty: | 1 Year |
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| 1. Adjustable Design: The pilot screw is designed to be adjusted using a screwdriver. This adjustability allows the operator or technician to fine-tune the air-fuel mixture to ensure optimal engine performance at idle. |
| 2. Small Size: It is a small, threaded screw located on the carburetor body, typically near the throttle valve, allowing easy access for adjustment. |
| 3. Small Size: It is a small, threaded screw located on the carburetor body, typically near the throttle valve, allowing easy access for adjustment. |
| 4. Tamper-Proof Caps (on some models): Some Yamaha outboards come with tamper-proof caps or limiters to prevent over-adjustment or unauthorized tampering. |
| 1. Regulates Idle Air-Fuel Mixture: The primary function of the pilot screw is to control the amount of air that mixes with fuel at idle speed. By adjusting the screw, the user can make the mixture richer (more fuel) or leaner (more air), depending on engine needs and operating conditions. |
| 2. Ensures Smooth Idle: Proper adjustment of the pilot screw helps the engine maintain a smooth idle, preventing stalling or rough operation at low RPMs. |
| 3. Improves Throttle Response: A well-adjusted pilot screw also contributes to better throttle response at lower engine speeds, making it easier to accelerate smoothly from idle. |
| 4. Helps Cold Starts: During cold starts, a properly adjusted pilot screw helps deliver the right amount of fuel for smooth engine starting and warming up, especially in marine environments. |
| 1. Varies by Carburetor Model: The size of the pilot screw depends on the specific carburetor used in the Yamaha outboard motor. However, they are generally small in size, ranging from 1 to 2 inches in length and less than 0.5 inches in diameter. |
| 2. Thread Pitch: The threads on the pilot screw are fine to allow for precise adjustment. Thread pitch may vary depending on the carburetor model. |
| 3. Head Type: Most pilot screws have a flat or slotted head, allowing easy adjustment with a screwdriver. |
| 1. Adjust for Smooth Idle: Regularly check and adjust the pilot screw to maintain a smooth and steady idle. Refer to the engine's manual for the proper adjustment procedure, as improper adjustment can lead to performance issues. |
| 2. Avoid Over-Tightening: When adjusting the pilot screw, do not overtighten it. Over-tightening can damage the screw or the carburetor threads, leading to air leaks or improper adjustment. |
| 3. Check for Air Leaks: If the engine is idling rough or stalling, inspect the area around the pilot screw for air leaks. A worn O-ring or loose screw can cause excess air to enter the carburetor, disrupting the air-fuel mixture. |
| 4. Clean the Screw and Port: If the pilot screw becomes clogged with dirt or fuel varnish, it may affect the adjustment. Clean the screw and the pilot circuit in the carburetor using carburetor cleaner to ensure proper function. |
| 5. Use Manufacturer's Settings: If the carburetor is completely disassembled, note the factory settings for the pilot screw (e.g., how many turns out from fully seated). This will help you reset it to the correct position after reassembly. |
| 6. Replace if Damaged: If the pilot screw becomes damaged, stripped, or worn, replace it with a new one. A damaged screw may not adjust properly and could cause fuel mixture issues. |
| 7. Periodic Adjustment: Due to changes in temperature, humidity, and other environmental factors, the air-fuel mixture may need occasional adjustment, particularly after long periods of storage. |
| 1. Rough Idle or Stalling: If the engine idles roughly or stalls frequently, it may indicate that the pilot screw is out of adjustment, causing an incorrect air-fuel mixture. |
| 2. Poor Acceleration from Idle: Difficulty accelerating smoothly from idle could be caused by an improperly adjusted or clogged pilot screw. |
| 3. Hard Starting (Especially When Cold): An improperly adjusted pilot screw can make it difficult for the engine to start, particularly in cold weather. |
| 4. Excessive Fuel Consumption: If the pilot screw is set too rich (too much fuel), it may result in excessive fuel consumption, fouled spark plugs, or black exhaust smoke. |
| 5. Lean or Rich Mixture Symptoms: If the mixture is too lean (too much air), the engine may hesitate, backfire, or run hotter than normal. If the mixture is too rich, the engine may run sluggishly or produce black smoke. |
| PART NO | DESCRIPTION |
| 63V-14301-00 | CARBURETOR ASSY 1 CARBURADOR COMPLETO 1 |
| 63V-14301-10 | CARBURETOR ASSY 1 CARBURADOR COMPLETO 1 |
| 679-14923-00 | SCREW, PILOT TORNILLO DE AJUSTE |
| 679-14555-00 | SPRING RESORTE |
| 63V-14527-00 | PLATE PLACA |
| 63V-14126-00 | GASKET EMPAQUE |
| 97803-04010 | SCREW, PAN HEAD TORNILLO CABEZA ABULTADA |
| 63V-14948-06 | JET (#48) INYECTOR (#48) |
| 679-14966-00 | RUBBER CAP CAUCHOCHAPEAU |
| 63V-14523-00 | SCREW, STOP TORNILLO DE TOPE |
| 90501-10326 | SPRING, COMPRESSION RESORTE DE COMPRESION |
| 63V-14984-00 | GASKET, FLOAT CHAMBER EMPAQUE CAMARA DE BOIA |
| 63V-14980-00 | BODY, FLOAT CHAMBER CUERPO CAMARA DE BOIA |
| 63V-14947-00 | JET, NEEDLE INYECTOR DE AGUJA |
| 676-14943-29 | JET, MAIN (#110) INYECTOR PRINCIPAL (#110) |
| 97980-04114 | SCREW, WITH WASHER TORNILLO, CON ARANDELA |
| 65W-14398-00 | GASKET EMPAQUE |
| 6G1-14992-00 | SCREW, DRAIN TORNILLO, SEGURO |
| 63V-14985-00 | FLOAT BOIA |
| 6G1-14546-01 | VALVE, NEEDLE VALVULA DE AGUJA |
| 676-14186-00 | PIN, FLOAT PASADOR DE LA BOYA |
| 663-14159-00 | CLIP PRESILLA |
| 6H4-14548-00 | PIN, FLOAT ARM PASADOR DE BRAZO DE BOIA |
| 98580-04008 | SCREW, PAN HEAD TORNILLO DE CABEZA CRUZADA |
| 98980-03006 | SCREW, BIND TORNILLO DE LIGAR |
| 95380-03600 | NUT TUERCA |
| 97980-04125 | SCREW, WITH WASHER TORNILLO, CON ARANDELA |
| 6G1-24452-00 | COVER CUBIERTA |
| 63V-24411-00 | DIAPHRAGM DIAFRAGMA |
| 6G1-24412-01 | BODY 1 CUERPO 1 |
| 6G1-24411-00 | DIAPHRAGM DIAFRAGMA |
| 6G1-24431-01 | GASKET, FUEL PUMP 1 EMPAQUE BOMBA COMBUST 1 |
| 6L5-24421-00 | VALVE, CHECK VALVULA DE RETENCION |
| 98580-04006 | SCREW, PAN HEAD TORNILLO DE CABEZA CRUZADA |
| 6N0-1432A-00 | PLUG TAPON |
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