Detailed Photos
Installation Instructions
Product Description
688-13610-00-00
Reed Valve Assy
For Outboard: Yamaha 50, Yamaha 75, Yamaha 80, Yamaha 85, Yamaha 90
692-13610-00-00
Reed Valve Assembly, Yamaha,
For Outboard: Yamaha 50, Yamaha 75, Yamaha 85
How the Reed Valve Assembly Works:
| 1. The reed valve assembly operates on pressure differentials within the crankcase. When the piston moves upward, it creates a vacuum in the crankcase, causing the reed valves to open and allow the air-fuel mixture to flow in. |
| 2. As the piston moves downward, the increased pressure forces the reed valves to close, preventing the backflow of the air-fuel mixture. This precise opening and closing process ensures the engine receives the correct amount of fuel and air for combustion. |
| 3. By regulating the intake of the air-fuel mixture, the reed valves help to maintain an optimal balance of pressure within the crankcase, leading to more efficient combustion and power output. |
Functions:
| 1. One-Way Flow Control: The reed valve ensures that the air-fuel mixture flows into the crankcase when the pressure inside drops (on the upward stroke of the piston), and closes to prevent backflow when the pressure rises (on the downward stroke). This one-way mechanism ensures optimal volumetric efficiency. |
| 2. Improved Low-End Torque: By controlling the flow precisely, reed valves help the engine generate better low-end torque, which is crucial for powering through the initial acceleration phase in outboard applications. |
| 3. Crankcase Sealing: Reed valves help to maintain crankcase pressure, which is vital for two-stroke engine performance. Proper sealing ensures that the fuel mixture is compressed and delivered effectively during the combustion process. |
Maintenance Tips:
| 1. Regular Inspection: Periodically check the reed valve assembly for signs of wear or damage, such as cracks, chips, or warping in the reed petals. Replace any damaged components promptly to maintain engine performance. |
| 2. Clean the Assembly: Keep the reed valve area clean and free of debris, which can interfere with the sealing of the reed petals and affect engine performance. |
| 3. Monitor Engine Performance: Pay attention to changes in engine performance, such as decreased power, poor throttle response, or unusual noises, as these can indicate issues with the reed valve assembly. |
| 4. Replace Worn Reeds: If you notice any wear or damage to the reed petals, replace them immediately to prevent loss of power and efficiency. |
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