It can be as low as 70 and will run, high is 120-150 and even higher, the main concern is equal values, a motor with 50 on one and 85 on the other is too much of a difference. 5% between the 2 reading is what you want.
Re: Evinrude 35 lots of blue smoke and some white? bad idle
When you do a compression test, remove both plugs. If you leave the other plug in, and there is a bad head gasket between the cylinders, you will get an erroneous reading.
White smoke indicates water getting in a cylinder somewhere.(Probably head gasket)
If possible, keep your lower unit in the water when you do the compression test. You may spot a little water blowing out of one the spark plug holes as the motor turns over. Hope this helps
When you do a compression test, remove both plugs. If you leave the other plug in, and there is a bad head gasket between the cylinders, you will get an erroneous reading.
I did a compression test today and got 109psi up top and the bottom I got 124psi. I did what you told me with leaving a spark plug in to see if it made a difference and it didnt...
