How To Make A Leak Down Tester

Why do leak testing?

Leak testing is done after a low and/or change (more than 10%) result from a compression test, or to get an idea of ​​how much of a measurable leak a motorcycle engine may have. Leak testing may be your only option for assessing engine health if your motorcycle has an automatic decompression valve or mechanism. Most modern 4-stroke motocross bikes have this feature for easy starting. Read more: how to disassemble a disposable vape pen | Top Q&A: how to create a leak tester

What does leak testing do?

The leak test will apply engine pressure through the spark plug hole when at top dead center (TDC). When in TDC, all intake and exhaust valves will be closed, and the piston will be at the beginning of its stroke. The only way the air pressure can escape is through the valve, piston ring and head gasket. Read more: how to disassemble a disposable vape pen | Top Q&A: how to create a leak tester

So what is considered an acceptable leak?

• Leaks less than 5% indicate the engine is in excellent condition
• Leakage up to 15% indicates engine in good condition
• Leakage above 15% indicates that the engine components are worn

Read more: how to disassemble a disposable vape pen | Top Q&A: how to create a leak tester

How To: Make your own leak tester

The easiest and cheapest leak tester possible already in your toolbox. You can take the tube from your compression tester and simply remove the Schrader valve from one end. The disadvantage with this method is that you cannot specify a leak value or percentage in the system because no measure is present. Runs better than $100. Here are pictures and video tutorials on how to do it. Everything can be purchased locally and it will take you about 30 minutes to build. Read more: how to disassemble a disposable vape pen | Top Q&A: how to create a leak testerRead more: how to disassemble a disposable vape pen | Top Q & AReading: how to make a leak tester Read more: how to disassemble a disposable vape pen | Top Q & AReading: how to make a leak tester The key to a leak tester is to create a limit between the pressure regulator and the pressure gauge. I used 5 minutes of epoxy and plugged the brass knob about ¼-1/2” deep. Once the epoxy dries, use a .040” drill bit (#60 drill bit) and drill through the epoxy. on a fast connection to save a bit of money. You should get a compression tester anyway if you’ve switched to leak testing. Read more: how to disassemble a disposable vape pen | Top Q&A: how to create a leak tester

How-To perform a motorcycle leak test?

The process of doing this check is really easy. The engine must be COLD during the test.

Bring the engine to top dead center (TDC). Refer to your service manual for this procedure.

Leave the motorcycle in high gear and ask for help on the rear brake.

Remove the spark plug(s). Remove the Schrader valve from the compression test tube and insert it into the socket.

Hook up leak test machine to 120psi gas level. Adjust the leak tester pressure to 100psi.

Connect the compression hose to the leak tester. Record the pressure on the leak tester.

Use a mechanical stethoscope to listen for leaks in the intake, exhaust and crankcase. Look under the radiator cap for air bubbles indicating a bad head gasket.

NOTE: Do not have any hand tools attached to the motor as it can spin under pressure.Read more: how to disassemble a disposable vape pen | Top Q&A: how to create a leak tester

Result

Leakage will be 100psi minus the pressure recorded. For example, let’s say we get 90psi, 100psi -90psi equals 10psi, or 10% leakage.Read more: how to disassemble a disposable vape pen | Top Q&A: how to create a leak tester

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