Mariner 15 HP 54 Stroke Playing up

Bigplumbs

Bigplumbs

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On my tender and play 3.4 m rib. I have a nice 15 hp 4 stroke Mariner outboard that performed flawlessly last year. This year it has now let me down on 2 occasions.

First occasion was all started well but after about 15 mins running it would only run at tickover. Took it home stripped the carb and it went fine. So I took it out today for a long blast up the river and it went a dream for about 2 hrs then I throttled back and this time it would not run a low speed. Got a tow back so all was ok.

I am thinking I have shite in my fuel so I will clean out the whole system and clean the carb again.

I was wondering if anyone else has had similar

Dennis
 
We are having a similar issue with our 6hp Mariner 4 stroke at the moment.

Ours is running bad at low revs but fine at high revs.

Have stripped and cleaned the carb, new spark plug, fresh fuel. Still not a happy engine :(
 
Well this is what I have done today:


Taken out all of the petrol
Removed the tank and cleaned out (But it was actually very clean)
Dip pipe filter is clean
Petrol pumped out well via the bulb
Removed and stripped down the carb
Sprayed and cleaned inside of carb
Poked through all jets with fine wire and sprayed carb cleaner all over
Cleaned out any small bits that were about (Actually hardly any)
Filled with new 95 octane petrol
I also upped the idle speed a little


She now runs on slow very well and as much as you can do in a tub runs at fast speed.


I can only now try her out on the water.


Pity I don't seem to have space for my little 3 hp 2 stroke as a back up when I do the tests


Dennis
 
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