You have got to start with an engine that is mechanically sound. If you can work the prop and find axial play [wobble], the case is worn out. The lower end needs to be free, but not sloppy. The cylinder should stay pumped up after you bring the piston to TDC for at least a few seconds. If it doesn't stay pumped, look for a head leak or bubbles in the exhaust ports. Bubbles in the ports indicates that your engine is only good for static display. Slop in the ball socket will make the engine run crappy, but it will run. If your engine passes these tests, then all you need to see is fuel spraying out the exhaust ports while cranking the engine...and just as importantly a good strong glow. It doesn't take much to get these engines to run as long as all the basic conditions are met. If you do a search on COX TD maintenance and tuning, I'll bet you come up with a few great articles.