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Old 05 April 2014, 15:23   #1
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Outboards and airfilters

So the reason for all this lovely two stroke smoke was a blocked jet in carb no 3. All sorted now, but can anyone enlighten me why don't outboards have an air filter element? Cars and motorbikes do, very odd.

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Old 05 April 2014, 15:36   #2
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Not much dust , mud & grit to get under an outboards hood!
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Old 05 April 2014, 15:38   #3
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Not much dust about like strimmers & lawn mowers & chainsaws theres not much likelihood of any seeds grass cuttings or sawdust flying about any sand blowing about will be too heavy to get through the hood intake though having said that i have had dandelion seeds stuck to the carb intake .
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Old 05 April 2014, 15:45   #4
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True but when you run it up at home on muffs over winter I guess that's not entirely true doh it's got to there that the offending gunk got in there

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Old 05 April 2014, 16:23   #5
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Most carbs/ jets / float -valves get blocked by contaminated fuel either from filling dodgy tanks , old fuel pipes breaking down -perishing . 2stroke oil cans usually have grit stuck around the neck if left about ,i keep my filling funnel in a plaggy bag until i need it ,, though i have know problems with some near brand new engines where overzealous tank fitting sealant has dissolved , gone through the filter then left a residue in the bottom of the float . Insects can also get into carbs if left stored for long periods ,,, you only want a spider having a crap on top of a jet : )
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Old 05 April 2014, 16:38   #6
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Lol I guess so, just luck of the draw. Thanks for the heads up

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Old 05 April 2014, 18:07   #7
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Quote:
Originally Posted by neil.mccrirrick View Post
True but when you run it up at home on muffs over winter I guess that's not entirely true doh it's got to there that the offending gunk got in there

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airflow into the carbs via airbox doesn't pass through the jets it passes over them & cant block them the muck you get in jets is from the fuel

airfilters stop grit & dirt getting sucked in & damaging bearings & pistons etc unless you test your engine in a sandstorm its unlikely to ingest much in the way of contaminates

the odd dandelion seed will just get burned during combustion
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Old 06 April 2014, 03:12   #8
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Ah fair point I'll check filters as well

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Old 06 April 2014, 13:00   #9
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We used to wakeboard on a delta river system, which was surrounded by farm land. One time the dust was so bad, we could barely see across the river. Lakes are cleaner, but there are a few places an air filter would be nice to have. Here in the USA they require an anti-backfire cover over the intake system, so few engines come with air filters, and fire suppression.
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