1989 Evinrude 8 hp - Runs great then dies after about 3 hours of trolling

[WarthogMan]

My 1989 Evinrufe 8 hp starts up and runs great but after about 3 or 4 hours of trolling she sometimes just dies. It takes me about 5 minutes and several pulls to get her to start up again. Once started, she runs great again. I've had this same problem occasionally on my 1986 Johnson 8 hp (essentially the same motor). I'm in Colorado so the lakes I fish are typically at about 8500 - 9000 feet altitude. Anyone have any ideas on what the cause could be and how to correct it? Could this be a vapor lock on the fuel pump? if so, would pouring cool water on the fuel pump help? Except for this annoying characteristic, both motors run great. Thanks

 

[nwcove]

i iwould suspect plug fouling from extended slow speed trolling. do you give it a " run" now and then while trolling ? does it smoke quite a bit once you get it to start after a stall out? maybe try a hotter plug if you dont do much wot running. jmo

 

[OptsyEagle]

I would ensure that my carb's gas mixture was set properly. Perhaps it has not been set for your altitude, and should be. You can do this with these instructions.

http://forums.iboats.com/forum/engi...sorted-carb-variations-by-joe-reeves?t=167352

Also, as stated above, whenever you are trolling for any period of time, it is recommended that you open up the throttle and let her rip for a few minutes or so to burn out the carbon crud that can start to form, especially on your spark plugs.

 

[WarthogMan]

Thanks nwcove and OptsyEagle! I'll open her up occasionally during trolling and check the carb adjustment. I greatly appreciate your help.

 

[JDusza]

lmao! After three hours I'd check the fuel tank! lol

 

[nwcove]

lmao! After three hours I'd check the fuel tank! lol

^^ whaaa??? you can troll for a weekend on a 5 gallon tank with that motor.