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Old 13 May 2019, 14:30   #1
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Outboard running poorly at idle

All, looking for advice.. I have a 2005 Yamaha 30D 2 stroke triple.. runs like a dream WOT and fast cruising but at idle and just above, it sounds like metal on metal clonking and it vibrates loads..

Any ideas?
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Old 13 May 2019, 15:44   #2
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Spark plugs new and gapped properly?

On the engine there should be a fuel bowl. Check that. There's a mesh filter inside that, so certainly wouldn't do any harm to replace.

On the carbs, drain the fuel bowls. Any contaminants, then I'd look at a carb strip down and rebuild.
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Old 13 May 2019, 15:57   #3
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Cheers Spartacus.. I replaced the plugs recently and gapped them right but may have over tightened?

Checked the fuel filter basket and had some crap in there, cleaned that out with brake cleaner and keeping an eye on it...


The carbs have fuel bowls? Okay.. will go looking for them..


It is a clonking sound..


Anyway, wish I could find a workshop manual for the engine!! Hey ho..


Thanks again..
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Old 13 May 2019, 16:20   #4
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Used to have a 25D outboard (mid 80s). These engines are bullet proof. On the carbs, the float chamber should have a brass hex drain screw (with slotted head).

Incidentally, I take it this is a pre-mix engine, not autolube?
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Old 13 May 2019, 16:33   #5
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Nope.. Autolube 3 pot..
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Old 13 May 2019, 16:36   #6
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I had. Similar issue with my 2008 etec. Turned out to be a faulty injector.
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Old 13 May 2019, 17:18   #7
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Ran ropey at idle but cleaned up as throttle opened? Would it clonk and vibrate?
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Old 13 May 2019, 19:53   #8
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Quote:
Originally Posted by gtflash View Post
I had. Similar issue with my 2008 etec. Turned out to be a faulty injector.
No injectors on this engine.

Sounds like classic carb trouble to me, particularly if there was debris in the filter.

Carbs will need stripping down and cleaning and then reassembling. You'll also need to look at setting the idle mixture to get it running smoothly.
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Old 14 May 2019, 13:54   #9
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Where the carb butterfly is in the carb bore, there will be 2 or 3 tiny holes that deliver petrol at tickover and up to when the main jet kicks in. Gel or dirt can block these, when you clean the carbs make sure these are blown out.
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Old 14 May 2019, 14:58   #10
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Cheers all!! I have watched a few YouTube vids and I feel confident I can successfully strip and clean the carbs.. put them back together again.... now that will be the fun part.. balance and tune them??? Erm.. lol.. hey ho..
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