Intermittent Fire on ole Merc

[aupshaw]

I have a '74 model 110, 9.8 hp that lost spark out of the blue. After tinkering a little ( disconnected the kill wire, checked continuity, swapped plugs, inspected wires, tighted loose connections) it began to fire.<br /><br /> However when I get it to the lake---nothing. This has happened twice. On the first occassion it cranked, I did some hunting but it wouldn't start when time to come home(lots of paddling).<br /><br />When it fires both cylinders fire and when it doesn't neither cylinder fires. I'm not convinced that my tinkering has helped anything but rather that the problem is intermittent.<br /><br />Any suggestions would be greatly appreciated.<br /><br />Allen

 

[DJ]

Re: Intermittent Fire on ole Merc

aupshaw,<br /><br />I'm nor Merc. expert.<br /><br />However, I would be checking every wire connection I could find. REMOVE them and clean thoroughly.<br /><br />Your kill switch sounds suspect to me. Bypass it, for testing ONLY, and see what happens.

 

[Waterbugtoo]

Re: Intermittent Fire on ole Merc

Thats not something always easy to find. If its not an igniton component with a problem, then it just about has to be wiring. Check every single wire for good condition (no breaks even within decent looking insulation), and also every ground connection. I would almost be willing to bet there is a corroded ground somewhere not making good contact, maybe kill switch as well.