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80hp mercury power comes and goes

geoffrey_james

New member
"hey fellas.
i'm having a


"hey fellas.
i'm having a heck of a time here. i have a 1980 80hp mercury. when i got it last year, it was awesome. it wailed. lately i've been having issues with the power. the latest happened yesterday on the lake. and this has been happening for awhile. when we get on the water, it seems the engine will only give me about half the power. almost exactly...
i think has something to do with lower leg. the little lever that clicks on and off when you want to lift the engine for transporting. we were going along, at 50% power, getting very angry! so i put it in neutral and reved it up. sounded good. so put it in gear and at a little too high of an rpm and it took of like a rocket. on the way back, i tried the same thing...nothing. after going along at 50% for 15 minutes, she jumped back to life on her own. i have found adding a little more fresh gas (and cutting down the oil/fuel mixture) has worked. and wiggling the engine in both neutral and with the engine not running, but in gear...
i just changed the leg oil and found maybe a few tiny metal shavings. but it seems that a whole bunch of things seems to spring it back into life. i got the engine from the guy who bought it in 1980 and he took really good care of it. it looks brand new! when i changed the oil, i also changed the spark plugs and the next day it seemed to work great. but the very next time, same thing...it is really confusing. i can't really afford to go to a mechanic, yet.
any thoughts?
thanks"
 
"Hi there!

Firstly, welcome


"Hi there!

Firstly, welcome to the forum!

There are plenty of boating veterans here that can solve any problem!

You could have poor fuel supply. Try priming the bulb when the motor is running, the pressure created could compensate for a weak fuel pump. Air could be seeping in at the connectors too.

Always mix fuel 50:1. Never run leaner than this, it WILL become an expensive venture. While you're at it, replace the impellor. They seldom stay reliable after the second year...

Besides, there are many mechanics that use this forum too...

We'll get your probem sorted fast. Just give us more info, we'll gladly oblige!


Regards from a cold and wintery Johannesburg in South Africa!

Benjamin."
 
"ok. now i have a much better

"ok. now i have a much better idea of what is going on. the problem seems to be 'something' needing to 'heat up'. we took the boat out on saturday. the engine did the same thing. only half power. we went for 20 minutes or so, then stopped for a drink for 10 minutes...then the engine started up a little slower. and was a little hesitant to get going. it would bog down when i gave it gas. then, snap...it took of like a rocket. hit 50kms according to the gps.
any thoughts?
electrical?
stuck choke?
sticky something?"
 
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