While a leaking 4 stroke engine will suffer a performance loss, two strokes that leak will also suffer other problems, like uncontrolled engine acceleration, due to the additional air leaking in and leaning out the mixture. The two stroke version works in a very different fashion. This is a truly handy tool, and with just a short amount of time, a mechanic can form a very detailed picture of the condition of the engine he is working on. Even the head gasket can be diagnosed, if there is a leak there, you will see bubbles coming out of the coolant in the radiator. Ring leakage can be heard in the crankcase breather hose. If the exhaust valves are a problem, the leak will be heard in the exhaust pipe. If the intake valves are leaking, you will hear the pressure escaping at the carburetor or throttle body. A great side benefit of using a tester of this type is that it is easy to pinpoint the leakage while the cylinder is pressurized. Anything above 15% would be an indication that engine repair is needed. Up to 15% leakage means an engine in acceptable condition. 5% or less leakage indicates an engine in excellent condition. If the cylinder is leaking, there will be a differential in pressure between the cylinder and the tester, and the tester will indicate the leakage in a percentage. Then, the cylinder is pressurized with compressed air through the tester. In the four stroke version, the cylinder is brought to top dead center on the compression stroke, so that all of the valves are completely closed. There are two types of leak down testers, one for four stroke engines, and one for two strokes. This is all very useful information to have when diagnosing the condition of an engine. A leak down tester will give you very specific numbers on the condition of the cylinder, not only an absolute number, but will also indicate where a potential problem may lie, whether it's rings, valves, or even cylinder gasket sealing. So how do you know for sure? This is where a leak down tester comes into the picture. A compression test won't tell you about the condition of the rings, or whether the valves are sealing, it will just say that things look good or bad. If you have owned a bike for a long time, or maybe just found a great deal on an older bike that has some miles on it, how do you know for sure what condition it is in? Sure, looking at tires or chain and sprockets will tell you how it is in general, but how do you know what is going on inside the engine? A compression test will tell you if the cylinder is sealing, and if all cylinders are in similar condition, but that's about it. It can be years, and thousands of miles of riding. Motorcycle engines, when properly taken care of, last a long time. Includes high-quality regulator and gauge.Hose and adapter fits 10, 12, and 14 mm spark plug threads.Meets FAA leak down test specifications for cylinders below 5.00 in.Includes 1/4" male industrial quick connector.Tests at 80 psi cylinder pressure minimum air source of 90 psi required.
Gauge accurately displays the total percentage of leakage past the rings, head gasket, intake and exhaust valves.Speeds up troubleshooting & helps to isolate bad components.Designed to check the amount of combustion chamber leakage in a 4-stroke engine.
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