more that 100 PSI the lowest must be no more that 70 percent of the highest reading
around 125 psi per cylinder
Not an easy question to answer. Compression readings are greatly impacted by your gauge, altitude, air density etc. I have seen many places where the compression on a KTM 65 should be at least 135PSI. I live at 7,000 feet, I purchased a cheap Harbor Freight compression gauge. I tested compression on 2 new KTM 65s and 2 Cobra 50s. The KTMs read between 88 and 95 PSI, the Cobras read between 60 and 65 psi. All the bikes run great and have plenty of power. I know my gauge reads low, I also had to use an adapter to fit the gauge on the cylinder head. From what I understand the adaptor also adversely impacts readings. I think the best bet calls for measuring compression when the engine is new, record the PSI, date temperature, elevation and gauge used as a benchmark. Check the compression again at intervals, when compression drops by more than 10% from the benchmark consider a rebuild. When compression drops by more than 20% rebuild is imminent.
Running a compression test is pretty much the same for all internal combustion engines.Remove all sparkplugs, marking where the wires went; you don't want to connect the wrong wires to the plugs when you're finished.Start with cylinder 1, screw in a compression gauge where the sparkplug just came out. Some compression gauges just press in, but I prefer the screw in type.Have an assistant engage the starter as though trying to start the engine. Obviously the engine won't start without plugs.You should hear and/or feel the engine compression on the single cylinder with the gauge in place; make sure that cylinder goes through compression cycle at least 3 times.Read the value on the gauge. The gauge should hold the compression reading, allowing you to record the reading.Write down the compression reading and the cylinder number.CLEAR THE COMPRESSION GAUGE. You can release the compression reading, usually by pressing a button or turning a knob. It's different for different style gauges.Repeat the process for all cylinders.Compare the compression value for all cylinders; they should be within a few percent of each other. Any small variance can be attributed to cylinder or valve wear. Large differences indicate severe problems. If any two adjacent cylinders have zero compression, you probably have a blown head gasket.
14:1 compression
50 is the bare min. Note some mowers have compression release.
compression is the force pushed on and object. The formula for how much pressure during compression is: force/area.
Compression springs cost about $3-$5 per spring.
120psi
You would have to look at a chart to see how much fat you are supposed to have.
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Compression anklets, socks, or long hose should NOT cause bruising. Most likely, the hose are too tight, too much compression. Talk to your doctor for a prescription for a lower compression product.
60 p.s.i.