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Old 27 July 2013, 04:58   #31
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Thanks for the response guys. The tank is plastic 25L tank, and I stored it in a shed. I put 20L new shell petrol in last week. At the dealer last week it was run off my tank. When I purchased it the dealer was explicit that it was a previous customer they were selling it for and therefore gave no guarantee,I guess a brokerage type arrangement. Although I have receipts from dealer who I paid, so I guessing some consumer law covers me to some degree. I am hesitant to let it go as they are rare but if I spend all season driving the 60 mile round trip to the dealer I may have to discuss alternatives. Are there lemons out there?
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Old 27 July 2013, 06:07   #32
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Spraying the carb in situ with a solvent does nothing, take the carb off, dismantle and clean thoroughly throughout and check for wear or issues - very easy, takes 30 mins, it's not engine specific, Google for 'how to' - that will sort it I'm sure.
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Old 27 July 2013, 08:03   #33
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Dropped it back to dealer they said will do an ultrasonic clean. Maybe it did not have such a good clean up in the first place, possibly just carb spray.i will see what next weekend brings and give an update. At this rate it should be sorted by the time I need to think about winterising it!! Need to do RYA how to plan your boat time course level 1
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Old 27 July 2013, 09:32   #34
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Dropped it back to dealer they said will do an ultrasonic clean. Maybe it did not have such a good clean up in the first place, possibly just carb spray.i will see what next weekend brings and give an update. At this rate it should be sorted by the time I need to think about winterising it!! Need to do RYA how to plan your boat time course level 1
sounds like a load of old chuff to me , the carbs need stripping and degreasing properly the float and needle can then be set up correctly

never done this myself but if you spray some stuff up the carb then it will just burn this off ,check your plugs to see how gunked up they are

again i would reccomend samt or fairweather marine, you need to go old school for old engines
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Old 27 July 2013, 10:25   #35
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Is 2006 an old engine? With an apparent 50hrs of having been run. I just took out the shed my old abused mariner 4, early 90s, last run in garden two years ago, lived on a sail boat, never flushed, kept it to practice my non existent mechanical skills. only had old petrol from decanted 15 hp tank when purchased, so at least a year old I guess. Got it running, so much easier using twist throttle as opposed to the idle knob. It didn't run smoothly but I don't blame it
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Old 27 July 2013, 13:10   #36
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Is 2006 an old engine? With an apparent 50hrs of having been run. I just took out the shed my old abused mariner 4, early 90s, last run in garden two years ago, lived on a sail boat, never flushed, kept it to practice my non existent mechanical skills. only had old petrol from decanted 15 hp tank when purchased, so at least a year old I guess. Got it running, so much easier using twist throttle as opposed to the idle knob. It didn't run smoothly but I don't blame it
naw im just old school it just gets me tata`s in a twist ,your losing the summer and cant get no answers
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Old 28 July 2013, 12:56   #37
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When I was in the dealers showroom explains my predicament yesterday, I mentioned the 100:1 ratio as emphasised by the dealer mechanic on purchase and also as emblazoned on a sticker on the cowling. I noted a quizzical look followed by a brief exchange about oil preferences. I also note the mariner manual cites 50:1. This does seem to be the topic of some confusion with 15hp mariner mercury yamaha, as is mentioned in several threads. Anyone have a definitive answer?
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Old 28 July 2013, 17:01   #38
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'Officially' the Yam manual states 100:1 after running in but I think 50:1 for commercial use which tells you something. It's been debated quite a lot on here, nearly all old school pre eco times 2 smokes were 50:1 so take from that what you will...
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Old 28 July 2013, 17:24   #39
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I've always ran engines on 50:1 rather than the stated 100:1 and never had any issues. Maybe a tiny bit more smoke. I believe the RNLI run all their engines on 50:1.
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Old 28 July 2013, 17:37   #40
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Is 2006 an old engine? it
Depends how it's been looked after, abused or messed with.. I have a 1992 Merc 15 (same as your mariner) ticks over sweeter and smoother than a lot of new four strokes.

As everyone says, simply spraying power tune through the carb won't work. The carb needs to come off, it is not a difficult job. You still may benefit from new fuel pump diaphragms.

If the dealer does put the carb in an ultrasonic bath they should remove these as it won't do them any good, and when the fuel pump is dismantled these diaphragms and gaskets should really be replaced as they can easily be damaged or distorted. As you say the engines had little use (50 hours in 7 years) these flimsy rubber parts can go brittle, along with the primer. There is a service kit available for these carbs, not cheap, but that along with a proper clean and set up should get you going.
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