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Started By
Message
40 mercury help...
Posted on 6/29/20 at 7:33 am
Posted on 6/29/20 at 7:33 am
I have a 40! merc 4 stroke (2 years old) and all of a sudden it won’t get up to but 4200 rpm in gear and will not bet up on full plane. I put it in neutral and it would red line if I would let it.
The foot has been in the lake water for several months when I forgot to raise it up out of the water the last time I used it.
Everything looks fine externally.
Any ideas?
Thanks
The foot has been in the lake water for several months when I forgot to raise it up out of the water the last time I used it.
Everything looks fine externally.
Any ideas?
Thanks
This post was edited on 6/29/20 at 7:40 am
8
Posted on 6/29/20 at 8:52 am to Sull
May be starved for fuel? Is your hose pinched? May be starved for air?
Posted on 6/29/20 at 9:19 am to CHEDBALLZ
Thanks. When I put it in neutral and throttled it it came up to full rpm so I figured it was getting the right amount of fuel/air
Posted on 6/29/20 at 9:24 am to Sull
Fuel pump or carb needs cleaning?
I attribute every problem on my boat to fuel pump or carb needing cleaning
I attribute every problem on my boat to fuel pump or carb needing cleaning
Posted on 6/29/20 at 9:28 am to Sull
High speed jet is plugged more than likely. May be able to just spray some carb cleaner or run some Techron through it to clean up if not pull carbs and clean.
Posted on 6/29/20 at 9:32 am to Sull
Get a small fuel tank and run some seafoam through it.
Posted on 6/29/20 at 10:33 am to windshieldman
quote:
carb needing cleaning
it's most likely fuel injected being 2 years old
Posted on 6/29/20 at 10:39 am to weadjust
quote:
it's most likely fuel injected being 2 years old
Ahhhh damn, I didn’t catch the how old it was part
Posted on 6/29/20 at 1:32 pm to Sull
quote:
When I put it in neutral and throttled it it came up to full rpm so I figured it was getting the right amount of fuel/air
This really won't tell you much. Motor needs to be under a load to figure out what is going on.
This post was edited on 6/29/20 at 1:33 pm
Posted on 6/29/20 at 1:39 pm to Sull
Are you running non ethanol? If you aren’t I guarantee you your carbs need a thorough cleaning
Posted on 6/29/20 at 2:48 pm to Sull
I had a similar issue with a newer smaller 4 stroke, never had a drop of ethanol in it, and people here told me it might be not trimmed out correctly. I have yet to fix it on mine, haven't been back out yet with that motor, so I can't tell you if that worked. But it's probably something to consider before you start taking things apart.
This post was edited on 6/29/20 at 2:49 pm
Posted on 6/29/20 at 3:08 pm to Sull
Check PowerPak.
Posted on 6/29/20 at 3:24 pm to lsuson
Yes running non ethanol
Posted on 6/29/20 at 7:13 pm to Sull
Run Non-ethanol fuel only with Seafoam in every gallon. After use, disconnect fuel line and run engine until it dies. Then there is no fuel left in engine/fuel lines to turn bad when setting up. The Walmart branded version of Seafoam is just as good and cheaper.
Super Tech Motor Treatment
Super Tech Motor Treatment
This post was edited on 6/30/20 at 9:05 am
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