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Old 30 August 2010, 17:12   #1
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Country: UK - England
Boat name: Sea Hornet
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Length: 5m +
Engine: O/B 90hp
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90HP Mariner 2 stroke snag

Hello fellow Ribsters

I've enjoyed reading the treads since recently joining. Now I have a problem of my own.

My 90HP Mariner 2 stroke (1999) is not happy in idle. I know 2 strokes don't like idle but this is worse. When forward or reverse is selected (engine hot or cold) the engine stalls. It restarts ok but any slow manoeuvring means lots of stops and starts. It started shortly after a major service in May and has gradually become worse. It will also occasionally stall whilst idling. If forward or reverse is selected with a good degree of throttle it usually prevents the stall.

Have any of you chaps got an idea what's wrong?

Thanks

J Wright
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Old 30 August 2010, 17:51   #2
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Country: UK - England
Town: Romney Marsh ,Kent
Make: Osprey 5.85
Length: 5m +
Engine: 90hp Tohatsu
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I had a similiar thing on a small 2 stroke and the plug was either wrong or wrong gap - I had used cheap plug when servicing, Mine used to be fine all through power ranges but would idle badly and then stall if you didnt pick revs up quick enough.

I put genuine plug in and that seemed to cure it..But must say at that point i also cleaned fuel lines out and replaced fuel filter again - so possible 2 cures?

It still serves me well 2 years on.. Hope this helps, sure others may have better or other ideas though - I am not a mechanic

Mike
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Old 30 August 2010, 18:07   #3
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Country: UK - Scotland
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Make: Ribcraft 6.8
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Engine: Suzuki df200
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i had the same engine with a very similar/same problem-carb clean sorted it out.

i took the carbs off and put the in a bath of petrol then blew compressed air in all the inlets/outlets-rebuild and cured.

cheers
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Old 30 August 2010, 18:23   #4
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Country: UK - England
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I would suggest it could be a blocked idle jet, we had that on our club yam a few years ago and it was due to the engine sucking up crap from the tank. We got really slick at cleaning the carbs out but until we completely cleaned the tank out the problem always came back, get a manual and blow the small jet/jets out. The ones on the yam 115 are about half a mil and the crud got past two filters and then got stuck.


after cleaning out the tank we have never had the problem re occur.

good luck
DaveJ
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Old 30 August 2010, 19:02   #5
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Country: UK - England
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90HP Mariner

Thanks Chaps.

I'm sure the workshop fitted the correct plugs so I'm thinking it's carb or jet.

I'll let you know.
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Old 31 August 2010, 03:10   #6
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if you want to give me a ring on 01869 326411 i will talk you through some of the fixes if you want to
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Old 31 August 2010, 08:16   #7
jpn
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had similar issue with a yammie 200 carb....some idle jets were clogged...
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