This guage is designed to correctly measure the pressure the pop-off spring releases at to ensure correct metering of fuel. It is absolutely critical to measure this when replacing the spring in your carb, or if you remove the spring and reset the lever height.
Using this tool will provide maximum horsepower and ensure you are competitive on the track.
Does your carbie seal properly? Do you hold pressure on pop-off? If you don’t, or you’re not sure, you need to replace your pop off spring & needle.
