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Old 14 February 2006, 15:10   #1
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Mariner 15hp 2 stroke frustration

Well, today was the first day out with my new Zodiac Classic Mk2C with Mariner 15 2 stroke. Pretty impressed with the boat, less so with the engine so far ...

The first 10 minutes or so were OK, but it did take too many attempts to get it started. Then when the engine was quite warm, it sounded like it was running too rich, and then stopped (right in front of the IoW ferry, oh dear, furious paddling required).

Following this, it was a real struggle to get it started again, and then when I put it in gear, it just died every time. Finally decided to give up.

My suspicion is this: having carefully followed the instructions in the manual regarding running in, I have twice as much 2 stroke oil as I should have. The manual says: 50:1 ratio in normal use, but 25:1 for the first tank. However, a sticker on the engine says 100:1 in normal use. I have 25:1 in the tank. Could this be the problem?

Any ideas?

BTW: I checked obvious things like: killcord, vent on the fuel tank, kinks in the fuel line.

cheers,
Simon
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Old 14 February 2006, 15:54   #2
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How new an engine is it? Many modern engines will cut out if there is no cooling water detected or an overheat.

Take the plugs out and have a look - if they are seriously fouled then that would cause probs.
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Old 14 February 2006, 16:12   #3
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Oh, it's a brand new engine, should have said.

There was a tell tale showing, though at tickover it's not much more than a dribble. With a few more revs it squirts out a bit more convincingly.
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Old 14 February 2006, 16:42   #4
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When I first got my Yam 20 HP it was a bugger to start the first time. A mechanic who was with me at the time told me this was normal with new engines as they were quite "tight". Seems better now - after being broken in. Again this was running on "excess oil".

I think the problem with stalling when you change into gear is that it hasn't warmed up enough - you are presumably running the revs a wee bit fast at tick over? But in order to change gear you need to have the throttle closed (otherwise the gear shift is locked). If I remember rightly this was a problem for the first trip out but not now. You either need to be very quick at closing the fast idle, changing gear and putting on some throttle or wait till its hot.

Tell tale doesn't sound right though mine definitely has a constant smooth stream at tick over.

NEIL
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Old 14 February 2006, 17:07   #5
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Right, find a quiet bay round the corner, with a pair of oars and get used to your engine, run some tests, I've got a Mariner 10 that has been spotless. They do need warmed up. If you shut the choke too soon and then ask for throttle it will die. If it still dies when hot, then the carb needs adjusting .. so ...dealer problem when u have the warranty
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Old 14 February 2006, 17:59   #6
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Don't run at 100:1 either - the environment will love you - the engine won't!!!
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Old 14 February 2006, 19:08   #7
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Mercury/mariner 15 telltales are inconsitant until thermostat opened up.
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Old 14 February 2006, 19:11   #8
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Quote:
Originally Posted by codprawn
Don't run at 100:1 either
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?
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Old 14 February 2006, 19:30   #9
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jsut an idea but it sounds like its oiling up the plugs and or requires carb or idle adjustment. When mixing 25:1 I have always given the fuel can a good shake to mix it all up. If its running rich it will be smoky, and slow to pick up when you rev it. As Phantom 19 says I think the Mariners have thermostatic tell tales.
Its nothing to worry about just needs setting up and running in, best of luck with the new boat, might see you over the summer in the Christchurch / Bournemouth area.

Alex
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Old 14 February 2006, 20:02   #10
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I know you've mentioned that you've checked the tank vent, etc.
Are all the fittings and clips on the fuel line secure? Try squeezing the primer bulb when it's running to see if this 'cures' the problem - it could be drawing air into the fuel line, or possibly the fuel pump under the hood isn't doing its job?
This forum is really helpful for trying to solve problems like this, but more often than not, a look over the engine is the best way forward.
If you can't spot anything obvious, take a trip down to the local/supplying mariner dealer and ask them to take a look at it. That's what your warranty is all about, after all.
Good luck.
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