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Old 29 July 2016, 13:00   #1
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Mariner 10hp OB Starting Problems

Evening all, I'm new here so be kind and bear with me

I'm new to the whole SIB / RIB scene but am so far absolutely loving it! I've always tinkered with cars and motorbike but boat engines are a novalty and I'm stuck....

I acquired a 2006 mariner 10 Hp, short shaft relatively cheap. I bought it as a project, since it didn't run - I was told it had no spark and needed a new CDI unit. Having got it home it appears to have a spark on both plugs so I thought I'd strip down and clean the carb (I thought perhaps a fueling issue).

Unfortunately with freshly cleaned carbs and what appears to be a reasonable spark, it still doesn't run; not so much as a splutter!

My question for the forum is, any ideas? What can I check next and how can I trouble shoot and eliminate various aspects of the carb or CDI.

Many thanks. Richard
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Old 29 July 2016, 14:13   #2
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Put some fuel in each cylinder put plugs back in and leads on try and start you might have a spark but may not be hot enough to ignight the fuel
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Old 29 July 2016, 14:25   #3
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Another avenue... if you pull the plugs after trying to start (before trying Jeff's tip) are they bone dry or wet with fuel... that will give you a big clue.
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Old 29 July 2016, 14:30   #4
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why not start with a compression test and go from there,
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Old 29 July 2016, 14:47   #5
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Quick compression test put your thum over each hole if it blows it off chances it's ok.
Are they new plugs?
Has it been for a swim signs of corrosion under the hood white deposits everywhere
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Old 29 July 2016, 14:47   #6
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Thanks for your super quick responses, much appreciated! The plugs didnt seem bone dry but I had been tinkering with a little easy start...should have paid more attention!

I did throw some fuel down each cylinder and nothing too exciting happened. I wasn't sure if I put too much down the hatch but you could be right about a weak spark.

What would diagnose the reason for a weak spark?

I guess I'd need to take to OB to a marine mechanic to do a compression test. What would that show? Can't say I've ever had one on any engine, always got there myself... Eventually!

Massive thanks for your help
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Old 29 July 2016, 14:54   #7
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I'll give the 'compression test' a go!

It all looks in pretty decent shape, although has been messed with a little. I'm told it's a 2006 model but appears to me like bit of a cut and shut. Pretty rough shape if it is a 2006.

No masses of corrosion or crud under the hood and carb looked in good shape! Looking into the engine the inlets looked a little rough which was why I thought it might not be the original block.
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Old 29 July 2016, 14:54   #8
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If the spark was good it would fire up after a few pulls you say you were told it needed a new CDI unit chances someone has done the ground work but not bothered lack of funds maybe.if you have low compression possibly kn--ked engine one made up of bits.
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Old 29 July 2016, 15:09   #9
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is there anyway I can check engine number against the number shown on the leg - ultimately would be good to know for sure where I stand.

I actually own another couple of Mariners a 6hp which runs great and a 7.5hp which is in bits. I was hoping to make this 10hp a runner with the parts available. The 10hp is exactly what I want (hopefully), powerful enough for my SIB, fairly recent and short shaft. I'd been 'making do' with a long shaft on my Honwave.... I know, I know, but hey I'm on a buget and having some great fun!!
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Old 29 July 2016, 15:17   #10
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Just a thought, could it be a duff kill switch? As there are 2 of them on that model. One where the cord attaches, and a push button one on the end of the tiller
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