I have a 1985 ATC250R and it has no spark. I have the owners manual and checked everything in the manual with an ohm meter except the cdi and the stator, and everything tests good with the exception of the primary side of the coil, which is .11 ohms, and the spec is .16 -.2. There are no dirty grounds and all the wire terminals are clean. I unplugged the 2 wires going to the coil and one of them has a small of voltage going to it when I kick it over, but since there is no spec in the manual for this, I don't know if the amount of voltage it is generating is within spec, plus my meter does not read peak voltages, so the reading I am getting is likely lower than the actual voltage. Since I can't test the cdi, I ordered a used one off Ebay which supposedly came off a running bike, and I tried it and it still has no spark, so it is possible that both my cdi, and the one I bought are bad.
Since I don't have a way to test the cdi or the stator, or know for certain that the other parts in the system are good, I was thinking of trying to find someone in my area that has a running 85/86 250r that might be interested in swapping some of their parts onto mine one at a time to try and find out exactly what part might be bad on mine instead of just buying used parts off Ebay that may also be bad, and I am happy to pay a very fair rate for someone to do this. I can bring my bike to their place. Thanks for any suggestions