Johnson 90hp

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    Posted: 01 Mar 2022 at 12:13pm
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hey any ideas what's going wrong with Johnson 90hp outboard not to sure why its running like this sounds a bit off and every now and then you hear a thump and shaking it usually has trouble starting and leaking a bit of fuel not to sure from where any help would be appreciated




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Post Options Post Options   Likes (0) Likes(0)   Quote smudge Quote  Post ReplyReply Direct Link To This Post Posted: 01 Mar 2022 at 1:16pm
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Moderator - Ninja
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That is misfiring. With an outboard you will need a systematic approach. The first checks would be to drain the carbs and check to see if there is water in them. Then I'd check the spark plugs. If you can get a good pic of the spark plug electrodes and post it on here so that were looking at the insulators that would be helpful. If you're unsure what any of that means your next call should be to an outboard serviceman.
Best gurnard fisherman in my street
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Post Options Post Options   Likes (0) Likes(0)   Quote smudge Quote  Post ReplyReply Direct Link To This Post Posted: 01 Mar 2022 at 1:19pm
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The leaking fuel - if it is from the carburettor area is likely to be a sticky float valve I should add.
Best gurnard fisherman in my street
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Post Options Post Options   Likes (0) Likes(0)   Quote Steps Quote  Post ReplyReply Direct Link To This Post Posted: 01 Mar 2022 at 1:29pm
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Anyone who is not set upto do so in fully equipped service workshop played with the timing?

When was the last technician/ work shop service?
When was the last time things like spark plugs changed/ gaps checked?

What happens when under load on the boat at sea?
Does it just miss once rpms get up?
Once speed rpms up does it miss and run out of power?

Check air valve in fuel tank open
 Check all fuel line joins and line for any cracks.
Check filters, including the under the cowel
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Post Options Post Options   Likes (0) Likes(0)   Quote Kandrew Quote  Post ReplyReply Direct Link To This Post Posted: 01 Mar 2022 at 8:57pm
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How old is the petrol and are there any air leaks in the fuel lines, if it’s leaking petrol then it could be sucking air while it’s running.
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