ORIGINAL: FLYBOY
First, it would help if you structure you sentances a bit so we can understand you better.
To answer what I think you are asking, no, you can't shell an engine out in seconds unless you are doing something really really wrong. They do not come out of the box ready to just run, some take some tinkering with the needles. You need to get them set right so they run right. If you can't get it, get help. It will save you a lot of time and trouble. It would be too hard to explain here how to make them run correctly not knowing anything about your experience. It sounds like you are new and need some help from someone local though.
[:-]The really really wrong part I do agree with like broken fuel lines in the tank or loose carb or bent needle valve or blown head gasket. I have had a lot of flying time from control lines to RC, I even had an experienced engine person set one up for me and it died a month later. these engines Ive been having trouble with were given to me from the guys in my club, they never gave me any information on them as there history, they just said they came out of a running airplane. what Im trying to figure out, is when an engine wears out the cylinder sleevs or piston, does this happen gradually or just a sudden dead stick and then no compression as when it was new and then the end,now its time to replace parts? I just cant buy that its all the tiny little percise settings of needles both high speed and low speed when the engine is a strong running tight engine, I have had engines even when slightley rich or lean settings corrected with a few clicks on the high needle while holding the nose of the plane up .