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Old 14 February 2006, 23:43   #11
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Quote:
Originally Posted by Polwart
Even if thats what the manual recommends? Its a new engine - surely if Mariner says it OK, then its OK - or they deal with the waranty claim? I know its common for people to run older engines oil rich - once things start to get worn - but are you suggesting ignoring the manufacturer for a good reason?

No he said the manual says 50:1 but a sticker on the engine says 100:1. Remember the manufacturers have all sorts of emmission regs etc to deal with. YES the engine will run on 100:1 but it will last a lot longer at 50:1
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Old 15 February 2006, 03:34   #12
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if the tell tail is a bit week and it cuts as it goes into gear and it is a new engine then perhaps the revs are just set too low, try raising the idle speed a bit so that you get a more steady stream from the tel tail and try that.
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Old 15 February 2006, 15:07   #13
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Thanks for all the helpful suggestions. Yes, I discovered that the tell tale is affected by the thermostat, which as it cuts in reduces the tell tale to just a dribble, ... until it cuts out again, and it spurts out nicely.

A quick visit to the local Mariner agent reassured me there was basically nothing wrong with the engine. I will take the advice of finding a quiet spot to get used to the engine - I think that's all it is. I was probably spoilt by turn-the-key 4 stroke electric start thingummy on my previous Mariner 60.

cheers,
Simon

PS: Still puzzled about the conflicting 50:1 to 100:1 oil ratios though. How can an official Mariner manual be wrong? How can an official Mariner sticker be wrong? Perhaps codprawn has the right hunch here ...
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Old 15 February 2006, 15:44   #14
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Quote:
Originally Posted by Simon Guest
...PS: Still puzzled about the conflicting 50:1 to 100:1 oil ratios though. How can an official Mariner manual be wrong? How can an official Mariner sticker be wrong? Perhaps codprawn has the right hunch here ...

I've no idea about your particular model but there was a time when the smaller Mariner outboards were actually Yamaha Origin engines rebadged. Mariner manuals said 50:1, Yamaha engine sticker said 100:1. A bit of extra insurance by Mariner. I was under the impression the Mariners are now Mercury motors.....it could be a similar thing or maybe you've got a Yam.
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Old 15 February 2006, 15:48   #15
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Codprawn,

I am inclined to agree with you. I have been told many times that it doesn't do any harm to add extra oil.

However, Yamaha's marketting material (http://www.lake-link.com/yamaha/outboardbuyingtips.cfm) implies that 100:1 actually gives longer engine life...

100:1 Fuel:oil ratio:
Conventional 2-stroke outboards mix oil with gas for lubrication. Modern techniques have enabled quality manufacturers to produce engines with closer tolerances. Some manufacturers continue to produce older technology engines that typically use 50:1, or twice as much oil. The 100:1 ratio means less oil required (producing) less blue smoke, smoother running and an engine with a longer life. Be sure to use only Boating Industry Association (BIA) certified 2-cycle oil in your new outboard. Yamaha pioneered 100:1 fuel:oil ratio in 1984.


Perhaps 2-stroke engines would have a better reputation with both the boating community for being less smelly and the wider population for being less poluting if we actually operated them to the correct oil spec.

Just some thoughts...
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Old 15 February 2006, 18:24   #16
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Quote:
Originally Posted by Polwart
Codprawn,

I am inclined to agree with you. I have been told many times that it doesn't do any harm to add extra oil.

However, Yamaha's marketting material (http://www.lake-link.com/yamaha/outboardbuyingtips.cfm) implies that 100:1 actually gives longer engine life...

100:1 Fuel:oil ratio:
Conventional 2-stroke outboards mix oil with gas for lubrication. Modern techniques have enabled quality manufacturers to produce engines with closer tolerances. Some manufacturers continue to produce older technology engines that typically use 50:1, or twice as much oil. The 100:1 ratio means less oil required (producing) less blue smoke, smoother running and an engine with a longer life. Be sure to use only Boating Industry Association (BIA) certified 2-cycle oil in your new outboard. Yamaha pioneered 100:1 fuel:oil ratio in 1984.


Perhaps 2-stroke engines would have a better reputation with both the boating community for being less smelly and the wider population for being less poluting if we actually operated them to the correct oil spec.

Just some thoughts...

Granted there will be less fouling etc with 100:1 and for boats that cruise around at low speeds all the time 100:1 could well be better - however once you start cracking open the throttle all that carbon will be burnt away and you will need more oil. Just look at the mixes the racing boys use - often 25:1 50:1 is considered very daring!!!
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Old 17 February 2006, 14:00   #17
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We tend to recommend using 50:1 rather than 100:1. The internals haven't changed and they only introduced the 100:1 to pass the new EPA regs that came out a few years back. It makes it better for the environment, but the engine would benefit from the extra oil.

Not that it matters as Merc/Mariner are no longer producing 2 stroke engines anymore, unless DFI.

ps. With regard starting, I find 3 primes on the primer and wind it up to fast idle, then pull. When it fires push the primer back in. I can get them started first time every time with this method
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Old 17 February 2006, 15:31   #18
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Final outcome (for me)

So here's my final outcome: after listening to lots of good advice, and having another outing, I now understand what's happening. At 25:1, when running at tickover, the plugs are fouling up with the extra oil. By revving the engine, I can burn it off, and all is fine. However, if I let it run for more than a few minutes at tickover, it dies, and is a real struggle to get going again. The engine is just about useable as it is, but I have to be careful to keep the revs up.

Looking forward to the next tank of fuel when I won't have to be so careful with my revs ...

But for now, I'm thinking about another problem.

cheers,
Simon
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Old 13 March 2006, 16:56   #19
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... and having used half a tankful at 25:1, topped up and now on 50:1, ticks over nicely, confirming previous theories. Am planning to move onto 100:1 after another half a tank.

cheers,
Simon
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