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I have not been able to start my 300ex that I just got off a guy. I was able to getting it running once, then never again. After a week of trying to make it run I got a compression tester and it is saying about 30 psi. Is this definitely the rings just worn out or can it be something elses? I can't even make it pop when I spray stater fluid in it.
 

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Was it smoking when you had it running?
 

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Just like what @UnkleRaRa said.... Was it smoking?? That could have been an indication your rings were worn badly... also what @mac102004 said, your valves may be bad if you can't get any compression.. Do another test and get back to us :)

If you find out that your piston and cylinder are worn, I have a whole top end for a 2000 300ex that I would be glad to sell you
 
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