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005 Inlet Tension Pop Off Spring
005 Inlet Tension / Pop-Off Spring
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005 Inlet Tension Pop Off Spring

Part Number: 005
Online Price: $2.00
005 Inlet Tension Pop-Off Spring for Precise Carburetor Fuel Control
Availability: In Stock.

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Description

005 Inlet Tension Pop-Off Spring for Diaphragm Carburetors


The 005 Inlet Tension Pop-Off Spring is a precision component designed to regulate the rate at which fuel enters the high and low side circuits of a diaphragm carburetor. This spring plays a critical role in controlling pop-off pressure, which directly affects fuel delivery—particularly at low RPMs and idle conditions.


Pop-off pressure refers to the amount of force required to open the carburetor's needle valve, allowing fuel to flow into the metering chamber. It is determined by the spring tension and installation height. This pressure is not the same as fuel pressure. Most fuel pumps deliver around 1 PSI, while pop-off pressure readings (e.g., 10 PSI) reflect the force needed to overcome the spring—not the actual pressure delivered by the fuel system.


The 005 spring is ideal for fine-tuning fuel delivery in small engines where stable low-speed operation and crisp throttle response are essential. It’s often used in performance applications or carburetor rebuilds where pop-off characteristics need to be precisely dialed in.


Key Features:

  • Regulates pop-off pressure in diaphragm carburetors
  • Ensures accurate low-speed and idle fuel metering
  • Compatible with many 2-stroke small engines
  • Helps maintain smooth engine performance and throttle response
  • Engineered for consistent spring tension and durability

FAQ

Q1: What is the function of the 005 Inlet Tension Pop-Off Spring?
A1: It controls the pop-off pressure in diaphragm carburetors, regulating when the needle valve opens and fuel flows into the metering chamber—especially at idle or low throttle.


Q2: Is pop-off pressure the same as fuel pressure?
A2: No. Pop-off pressure is the force needed to overcome the spring tension and open the needle valve. It is not related to the fuel pump’s output pressure, which is usually around 1 PSI.


Q3: What engines or carburetors are compatible with the 005 spring?
A3: The 005 spring is compatible with many small 2-stroke engines using diaphragm carburetors, including those from Tillotson, Walbro, and similar brands.


Q4: Can I adjust pop-off pressure with the 005 spring?
A4: Yes. Pop-off pressure can be fine-tuned by changing the spring’s installation height or using different spring tensions. The 005 provides a specific baseline suited for low-speed control.


Q5: When should I choose the 005 over other springs?
A5: The 005 spring is ideal when you need smooth low-speed operation and precise fuel control in small engines—especially in tuning or rebuild applications.

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