It starts about 50% of the time if and only if I keep my foot part-way on the accelerator and I use starter fluid. Sometimes it makes a fart-like sound initially. I managed to set the timing to 12 degrees BTDC while I disconnected the vacuum advance. Vacuum pressure was 14" during a start up. I checked all hoses and could not find any holes, though I did not spray carburtor cleaner to check for leaks. I also triple checked the spark plug wires.