I'm restoring a 1959 35hp Johnson RDS-20 that was not run for about ten years. I've replaced the line and sqeeze bulb from the tank to the motor. Compression is 150psi (cold) both cylinders. I can get it to start using the choke and it runs for about ten seconds then stops. It will start again then does the same thing. Any ideas? Also, do you know a good source for parts?