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Started By
Message
Outboard issues
Posted on 5/27/25 at 10:55 am
Posted on 5/27/25 at 10:55 am
I think I got it narrowed down, I just want others opinions
Had an outboard sitting up, a 40 Yamaha. Cranks fine. Revs fine. When under a load, it won't go over 1200-1500 rpms and won't get on step. Launched yesterday and ran fine. Got up on step then bogged down after a minute or so and went to an idle... high speed jets?
Also, want pissing when hooked up to a hose. When I got on step it pissed but as soon as I had to idle it stopped. Assuming the impeller.
Thoughts?
Had an outboard sitting up, a 40 Yamaha. Cranks fine. Revs fine. When under a load, it won't go over 1200-1500 rpms and won't get on step. Launched yesterday and ran fine. Got up on step then bogged down after a minute or so and went to an idle... high speed jets?
Also, want pissing when hooked up to a hose. When I got on step it pissed but as soon as I had to idle it stopped. Assuming the impeller.
Thoughts?
7
Posted on 5/27/25 at 11:04 am to Dtbtiger
Replace impeller and clean carb
Posted on 5/27/25 at 11:05 am to Dtbtiger
Sounds like maybe a fuel issue (maybe air is getting mixed?). It revs fine and seems fine out of water because there is no load which doesn't use as much fuel.
Posted on 5/27/25 at 11:11 am to Dtbtiger
quote:
When under a load, it won't go over 1200-1500 rpms and won't get on step. Launched yesterday and ran fine. Got up on step then bogged down after a minute or so and went to an idle... high speed jets?
Possible, but I would check fuel lines, in line filters, and bulb first.
Then carbs, then high pressure filters.
quote:
Also, want pissing when hooked up to a hose. When I got on step it pissed but as soon as I had to idle it stopped. Assuming the impeller.
yes, likely
Posted on 5/27/25 at 11:52 am to Dtbtiger
High speed jets it sure sounds like. Pull that carb, and soak it. Spray in carb cleaner likely won't get it done.
Posted on 5/27/25 at 12:03 pm to Dtbtiger
Non-ethanol fuel? If not, then I would recommend the following:
Carburetor cleaning spray (CRC), empty tank, fresh fuel (non-ethanol), new fuel filter, replace primer bulb, Sea Foam or Ring Free work well.
Remove the carburetor(s) and clean thoroughly.
Carburetor cleaning spray (CRC), empty tank, fresh fuel (non-ethanol), new fuel filter, replace primer bulb, Sea Foam or Ring Free work well.
Remove the carburetor(s) and clean thoroughly.
Posted on 5/27/25 at 12:20 pm to Tridentds
quote:
High speed jets it sure sounds like. Pull that carb, and soak it. Spray in carb cleaner likely won't get it done.
This is the answer, had a 90 Yamaha that would have this exact issue. Clean the high speed jets and she was good to go.
Posted on 5/27/25 at 1:46 pm to Mushroom1968
This
Posted on 5/27/25 at 2:01 pm to Dtbtiger
Make sure you mark each carb with a zip tye and replace in same hole on block.
Posted on 5/27/25 at 2:17 pm to TexasTiger
quote:
High speed jets it sure sounds like. Pull that carb, and soak it. Spray in carb cleaner likely won't get it done.
This is the answer, had a 90 Yamaha that would have this exact issue. Clean the high speed jets and she was good to go.
Same with a 115. Don't forget to check fuel filter.
Posted on 5/27/25 at 8:41 pm to Dtbtiger
Make sure that you do not have oil in your fuel.
Posted on 5/27/25 at 10:44 pm to bearhc
quote:
Make sure that you do not have oil in your fuel
Its oil injected
I plan on tearing it down this weekend. Revved up fine on the muffs again today, threw up 4500 rpms but then stuck it in a 55 gallon drum and same thing, won't go above 1200
Posted on 5/28/25 at 12:05 pm to Dtbtiger
Another thing to check- fuel lines. If they're old, especially the Grey lines, ethanol will eat them and degrade the inside.
My current motor- previous owner thought it had a bad fuel pump. Fuel lines were degraded so bad I couldn't even blow compressed air through them.
My current motor- previous owner thought it had a bad fuel pump. Fuel lines were degraded so bad I couldn't even blow compressed air through them.
Posted on 5/30/25 at 12:03 pm to TFLEX
Are yall soaking it in marvels or the gallon of carb cleaner?
Posted on 5/30/25 at 12:24 pm to Dtbtiger
Ultra sonic cleaners work the best. If you don’t have one use the gallon of carb dip.
Posted on 5/30/25 at 8:15 pm to Cypressknee
2-3 bottles of Real Lemon juice and a zip lock bag and you will never buy carb cleaner again. Been using it for 15 years and it really works. Eats that fuel gunk/varnish up.
Posted on 5/30/25 at 10:14 pm to TFLEX
quote:
Another thing to check- fuel lines. If they're old, especially the Grey lines, ethanol will eat them and degrade the inside
2nd this opinion. It's a cheap fix if it is the fuel line so it makes sense to start there. I was having the same idle fine lose power on acceleration. The liner on the inside of the fuel line has separated from the inner wall of the hose, causing it to collapse when the fuel pump pulled fuel when accelerating. At idle with the lower pressure the liner expanded again, allowing it to idle normally.
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