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020 Inlet Tension Pop Off Spring
020 Inlet Tension Pop Off Spring
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020 Inlet Tension Pop Off Spring

Part Number: 020
Online Price: $2.00
020 Inlet Tension Pop-Off Spring for Precision Carburetor Tuning
Availability: In Stock.

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Description

020 Inlet Tension Pop-Off Spring for Diaphragm Carburetors


The 020 Inlet Tension Pop-Off Spring is a critical tuning component for diaphragm carburetors, designed to control the rate at which fuel flows into the high and low side circuits—especially during low-speed engine operation.


This pop-off spring directly influences the pop-off pressure, which determines when the needle valve opens to allow fuel into the carburetor. It's important to note that pop-off pressure is not the same as fuel pressure. While your fuel pump typically produces no more than 1 PSI, the pop-off pressure—measured in PSI—is dictated by the spring tension and installation height, not by the fuel system pressure itself.

For example, a 10 PSI pop-off rating does not mean your system must generate 10 PSI of fuel pressure. Instead, it refers to the pressure required to momentarily overcome the spring tension and open the inlet needle valve.


Ideal for tuning two-stroke engines, small engines, and other carbureted setups, the 020 spring offers consistent performance and helps optimize fuel delivery for smoother idle and throttle response.


Key Features:

  • Precise Control of Fuel Flow at low RPMs
  • Engineered for Diaphragm Carburetors – High and low circuit regulation
  • Durable Spring Tension – Reliable pop-off pressure calibration
  • Ideal for Small Engine Tuning – Go-karts, chainsaws, scooters, and more
  • Compatible with most popular carburetor models


Common Applications:

  • 2-Stroke Engine Carburetors
  • Small Displacement Engines
  • High-Performance Tuning
  • Off-Road and Racing Applications


Optimize your carburetor’s performance with the 020 Inlet Tension Pop-Off Spring – where fuel control meets precision tuning.

FAQ

What is a pop-off spring in a diaphragm carburetor?

A pop-off spring controls when the carburetor needle valve opens by setting the pop-off pressure. This helps regulate how much fuel enters the engine, especially at low speeds.


Does the pop-off spring control fuel pressure?

No. The pop-off spring determines pop-off pressure, not fuel pressure. Fuel pressure is generated by the pump and is usually around 1 PSI, whereas pop-off pressure is a function of spring tension and needle valve resistance.


What is the ideal pop-off pressure for my carburetor?

It depends on your engine setup, carburetor type, and performance goals. Typically, a pop-off pressure between 8–12 PSI is common for small 2-stroke engines. The 020 spring usually delivers reliable results in this range.


Is the 020 pop-off spring compatible with all carburetors?

The 020 spring is compatible with most diaphragm-style carburetors used in 2-stroke engines, such as those in go-karts, chainsaws, and scooters. Always check your carb model for fitment.


How do I install or adjust the 020 inlet tension spring?

Installation typically involves removing the metering lever assembly and replacing the existing spring with the 020 spring. Ensure the correct install height and use a pop-off pressure gauge to test and tune.

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