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Decompression - What the!?!

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I did a compression test on my XR250L and it was 120PSI and 140PSI when I addes a little oil to the cylinder. I was in the process of taking the engine out of the bike and I noticed that the decompression cable was not attached.

Could this be the cause of my low compression? What the heck does the decompression lever do anyway?

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Your compression readings look about normal for dry/wet tests on a bike that has some miles and wear. The readings do not appear to show any kind of a major problem. The compression release is full off when the cable is not hooked up. If the compression release was stuck on you would have little to no compression pressure.

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