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007 Inlet Tension Pop Off Spring
007 Inlet Tension / Pop-Off Spring
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007 Inlet Tension Pop Off Spring

Part Number: 007
Online Price: $2.00
007 Inlet Tension Pop-Off Spring for Carburetor Pop-Off Pressure Control
Availability: In Stock.

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Description

007 Inlet Tension Pop-Off Spring for Diaphragm Carburetors


The 007 Inlet Tension Pop-Off Spring is a precision component designed to regulate the rate of fuel delivery to both the high and low side circuits of a diaphragm carburetor. This is especially important during low-speed engine operation, where proper fuel metering is critical for stable idle and smooth throttle transitions.

At the core of this regulation is pop-off pressure—the pressure at which the inlet needle valve opens to allow fuel into the metering chamber. This pressure is determined by the tension of the spring and its installed height, and it should not be confused with fuel pressure itself.


While a typical fuel pump only delivers about 1 PSI of pressure, pop-off pressure readings (e.g., 10 PSI) refer to the amount of pressure required to overcome the spring tension—not the amount of pressure the fuel pump must produce. The spring does not control fuel pressure; it controls when and how fuel is admitted into the carburetor via the needle valve.


The 007 spring is ideal for those seeking precise control over fuel delivery and pop-off characteristics, making it suitable for fine-tuning two-stroke and small engine performance.


Key Features:

  • Regulates pop-off pressure for consistent fuel flow
  • Supports accurate carburetor tuning for low-speed operation
  • Ideal for diaphragm-style carburetors in small engines
  • Engineered for use in performance and standard applications
  • Compatible with many Tillotson, Walbro, and similar carburetor models

FAQ

Q1: What does the 007 Inlet Tension Pop-Off Spring do?
A1: It regulates pop-off pressure in diaphragm carburetors, which controls when the needle valve opens to allow fuel into the metering chamber—especially at low engine speeds.


Q2: Is pop-off pressure the same as fuel pressure?
A2: No. Pop-off pressure is the force required to open the carburetor needle valve, determined by spring tension and install height. Fuel pressure comes from the pump and is typically around 1 PSI.


Q3: What carburetors are compatible with the 007 spring?
A3: The 007 spring is compatible with most diaphragm carburetors used in small engines, including Tillotson, Walbro, and similar brands. Always confirm your model before use.


Q4: Can I use the 007 spring for performance tuning?
A4: Yes. The 007 spring is suitable for both performance and general-purpose tuning where accurate pop-off pressure control is required.


Q5: How do I adjust pop-off pressure using the 007 spring?
A5: Pop-off pressure can be fine-tuned by modifying the spring's installed height or selecting a different spring tension. Use a pop-off pressure tester for accurate measurement during setup.

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