81 Evinrude 150 cutting out

[PhilMac]

hey guys,
ive got a 1981 Evinrude 150 with a fairly recent rebuild. when i take it out it will usually do fine for 15 to 20 minutes under half throttle. after that it will cut out. sometimes it will bog down for 5 or 10 seconds before cutting out. and it seems that when i try to go faster it will die quicker. i can let it sit for about 15 - 30 minutes and it will crank and run fine but it will do it again before too long. i have replaced the fuel pumps because of advice from a mechanic, but it did not help me. i have been told a bad temp sensor could be the problem, but i'm not sure. please help!

 

[Reggie08]

Re: 81 Evinrude 150 cutting out

When was the last time the carbs were removed, cleaned thoroughly and rebuilt?

 

[PhilMac]

Re: 81 Evinrude 150 cutting out

I am not sure, i bought the boat last summer and the owner told me the motor had been rebuilt recently. i am assuming the carbs were checked then but i'm not sure.

 

[emdsapmgr]

Re: 81 Evinrude 150 cutting out

Not unusual to have ignition problems when the engine gets hot. That's when electrical components tend to fail. Take a timing light with you and when it starts to cut out, put the light on each plug wire and see if you get constant, bright flashes. Looks for intermittent, weak or no fire problems in the flashes.

 

[PhilMac]

Re: 81 Evinrude 150 cutting out

i figured if it was a ignition problem a miss would be felt or heard, instead of it just running one second fine and then not the next. Next time i go out ill give it a shot though

 

[Benny1963]

Re: 81 Evinrude 150 cutting out

phil im running a 175 crossflow and just got rid of 150 1983
had same probs with motor the150 it had clogged low and high speed jets
bad coil ground and a fuel line pulling air
i rebuilt carbs cleaned all elec conects for coils and stator replaced fuel line large bulb 3 eighths line only linked and sinked set throttle pickup timeing
and wot timeing and swapped to ql 77 jc4 plugs from the surface gap
made sure i had bright blue spark took it to the river set idle rpm and havent had the first prob,ran like scalded dog every time put my mckee
down river at50 mph at 5500 work with it you will get it
oh and run a comp check

 

[Reggie08]

Re: 81 Evinrude 150 cutting out

Do you have a primer bulb on your tank?