[Cobra20646]

Two things I would try to attempt to isolate the problem.
First, if you have a voltmeter, measure the voltage at the starter when attempting to turn over the motor. Should not drop below 9 volts under normal conditions.
Second, pull all the spark pulgs and disable the ingnition and turn over the motor. Without the compression or too early ignition, it should turn over very easily. Measure the voltage again.
Third..... tell us what happened when you did the above.
- Jim -