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Old 07 July 2014, 15:29   #31
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im thinking of swapping my heavy 2002 Yamaha 25 for one of these am I doing the right thing the yam just runs faultlessly all the time im having second thoughts now
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Old 07 July 2014, 15:31   #32
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If it ain't broke......
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Old 07 July 2014, 15:44   #33
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Quote:
Originally Posted by beerbelly View Post
im thinking of swapping my heavy 2002 Yamaha 25 for one of these am I doing the right thing the yam just runs faultlessly all the time im having second thoughts now
A gunked up carb can happen to any outboard. I have 2 x 2006 two stroke Mariners..one is a 3.3hp and one a 25hp.. I run dry every time I flush them and they start no problem at all. The 3.3 has been in the family since new but I have only had the 25HP for two seasons however I am very happy with it.

I also had a brand new Tohatsu 4hp four stroke a couple of years back and although it was an ok outboard..it was a pig to start and flooded easily. I passed it on.

Give me the reliability of the two stroke any day..but Im sure everyone has their own favourite brand of engines and there is also a pig in everyone's life

Hope you get yours going again Max
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Old 07 July 2014, 15:47   #34
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the guy also tells me its normal for a 2005 mercury 15 that there isn't always water coming from the telltale this is new to me as all my previous outboards have pee,d constantly as does my Yamaha advice would be apreciated
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Old 07 July 2014, 16:00   #35
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Its normal for my 25HP mariner not to pee water until it is up to running temperature.. the thermostat is the cause of this..so I think he is correct ?

however mine pees constant once it is warmed up..perhaps a couple of minutes after starting from cold.

Its easy to change the thermostat if it is a bit old or rusted..think it was only around 20-30 quid for a new one and gasket.

I changed both thermostat and impeller when I got mine second hand, as I didn't know its history..would do the same with any second hand outboard..its not difficult to do on a Mariner 2 stroke
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Old 07 July 2014, 16:05   #36
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thanks that's basically what he said once warm it pee,s fairly constantly ill have to see it running.cheers
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Old 07 July 2014, 17:11   #37
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Beerbelly - Perfectly normal with the Mariner as noted above due to 'stat.

Better the devil you know but all engines have issues regardless of make.

Anyway, to finish off the post earlier this evening with the pic, once I had the carb off I blew through all the orifices and jets and cleaned up the gunky plunger so it moved freely again.

And...bingo! It started on idle once more. Not sure what the plunger thing actually does but something to do with flow from the float bowl?!? I'm pretty sure that was the issue rather than a blocked jet?

However, on disassembling I mistakenly moved the mixture screw setting so need a little more help!

Can anyone give me a layman's guide/ballpark to setting this mixture screw correctly on the Mariner and an idle setting as all the workshop manual figures are for an engine in gear on the water...?

And I did not note which way up the float should go in the bowl. One side has a slightly raised concentric ring that I guessed should go against the brass float pin thingy rather than against the base of the bowl?
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Old 07 July 2014, 17:19   #38
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Reaching the end of my tether with outboards...non-runner...

A rough guide is anywhere from a 1 1/4 to 1 1/2 turns out from lightly seated for mixture screw.

Idle screw is a suck it and see.
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Old 07 July 2014, 18:59   #39
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twas the carbs then great result well done chaps ,hoping for a similar result myself you really need to get a vacuum gauge on to set them correctly , i can reccomend windsor marine services this guy knows carbs
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Old 08 July 2014, 04:15   #40
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Max that is the acceleration pump
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