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Old 26 February 2014, 15:08   #11
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Don't forget to choke the engine. On Merc/Mariners this is done by pushing the key up into the throttle box.

If you do this you may find it helps it start. However a service, particularly cleaning plugs will help.

Chris
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Old 26 February 2014, 15:28   #12
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I agree as a Mariner 2 st owner with all the pointers from the guys as I have had similar issues. One thing I have learned is that it's fast idle or choke you may catch the engine after using choke but they cancel each other out!!
One other thing check you battery leads and connections all the way from bat to engine also check starter solenoid. Hope this helps. Since I renewed my bat cables and starter I've been a lot better.

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Old 26 February 2014, 15:51   #13
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I would also check that the choke is getting fully closed by the choke solenoid. This happened to me once, we spent hours in the early days, engine would not start. Changed plugs, checked everything

Did some fine checking and found that the choke flaps were not quite fully closed, used the manual override and the engine started immediately, finally but a kink in the fine lever to the chokes (to take up the slack) and the engine never missed a beat.

Just have a quick check and make sure the chokes are fully closed when the key is pressed in. You shouldn't be able to move them any further
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Old 26 February 2014, 16:26   #14
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the cold start isnt a traditional choke mechanism, it is an enrichener which dribbles fuel into the crankcase
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Old 26 February 2014, 17:58   #15
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Hi
You could try taking the plugs out and look at the colour: -
white or light grey - running lean
Chocolate - correct mixture
Black - too rich
This could give you an indication which carb may have a dirty jet.
Hope it helps
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Old 27 February 2014, 03:22   #16
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This is what i would do if it was mine or a customers OBM.
1/look at the colour of the tip on the spark plugs, make sure that they are the correct s/plugs, and properly gapped.
2/I would remove the carbs, strip examine and clean, re-assemble as per factory spec.
3/when it was running make sure the timming was within the factory spec.
4/ synchronize the carbs.Dont tuck the obm right under have it straight up and dowm.
when it is tucked under it is running in arich condition
5/to sync the carbs, with the obm ticking over the screws that hold the rod that operates the throttle slacken so the engine sucks the butterflys shut then carefully re-tighten screws.
I would set all the carb idle mixture screws at one and a half out from lightly seated, and dont forget to check the oil pump lever is in the correct position.
Obviusly check compressions
On the coast guard obms that I used to service I fitted a transit bolt across the the transom brks so the leg couldnt be tucked right under.
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Old 27 February 2014, 07:59   #17
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when you have done the above, you should have roughly about a 200rpm rev change from nuetral to in fwd gear, then you know you are as near to spot as you will probaly get. Like most things its easier to do than write about.
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Old 27 February 2014, 16:54   #18
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That told me

Quote:
Originally Posted by Festinghouse View Post
the cold start isnt a traditional choke mechanism, it is an enrichener which dribbles fuel into the crankcase
Sorry guys, thought it was a choke flap operation, didn't want to confuse.

Best of luck with your investigation
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