It just stops

[lionelm61]

Hi, I am hoping someone can help me with my 1978 55evinrude. I have had it tested and mechanically everything is working well, it also has new coils . The problem is when it starts to warm up suddenly it will sort of backfire and stop instantly but will generally start again. Really annoying as I have had to cancel our holiday to warnambool due to it not running correctly. Any ideas would be much appreciated Thanks Lionelm 2days later and still the same problem, I have changed some dodgy wiring and power pack, cleaned carbs and reset. Even changed the fuel,not to mention Removed 95% of my hair. Seems to be backfiring through the exhaust. Hope someone can help me. Cheers lionelm

[boats.net]

Backfiring through intake is usually lean fuel condition. Backfiring through exhaust is usually timing or ignition problem. Check fire to each plug with timing light to see if all are firing.