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Stalling in gear


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G’day legends,

I have an issue with my 2007 80hp Yamaha outboard.

It stall when in gear.

The outboard idles great (due to the cpu forcing a higher rev and fuel feed) until I put it into gear - then the revs drop back to avoid excess force on the transmission, followed by a gradual stall.

the engine idles out of gear at 1100-1200rpm, and 5-800 in gear before stalling.

I have replaced all filters, all spark plugs, compression it’s good, fires on all cylinders, have checked all electrical connections and it has no vacuum leaks that I can find.

could it be an electric choke issue?

i am completely out of ideas.

any advice will be greatly appreciated.

cheers everyone!

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5 hours ago, scottyboy said:

Fuel tank breather?

Cheers Scotty 

I have pulled the floor up, drained the tank, replaced with fresh fuel, disconnected and blew out the fuel line and priming bulb, the breather is clear and the sensor is clean and serviceable. I’m baffled...

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IAC faulty? That's the Idle Air Control, the little device that regulates idle speed and fuel, 1,100RPM idle is way high.

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Interesting. A recent model Yamaha experiencing mechanical issues. I was lead to beleive by some on this forum that such a thing didnt exist !

Not to fret Ningaloo. We have some very good gear heads on this forum who im sure will go the extra mile to help you sort out the issue. Goodluck !!

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Idle at 1100  out of gear is definitely too high... on some other outboards you would not be allowed to shift into gear... 660-800 is where I have seen idle normally which ties into your takeoff in gear RPM.  Sounds like your timing settings are off.  There are settings that advance spark etc once you start to take off. Has any work been done on timing or on the timing flywheel recently? 

Cheers Zoran

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5 hours ago, GoingFishing said:

Interesting. A recent model Yamaha experiencing mechanical issues. I was lead to beleive by some on this forum that such a thing didnt exist !

Not to fret Ningaloo. We have some very good gear heads on this forum who im sure will go the extra mile to help you sort out the issue. Goodluck !!

Not too sure where that comment is aimed, but, the motor is 13 years old, just how long do you think a motor should go without attention?

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26 minutes ago, noelm said:

Not too sure where that comment is aimed, but, the motor is 13 years old, just how long do you think a motor should go without attention?

The F80BET is a 2014 model to my knowledge, so 6 years old.

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First post says he has trouble with a 2007 Yamaha? Still, I offered assistance, but more than happy to stay right out of any discussions about "stuff", logging out.....

Edited by noelm
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Regardless  of age the question is what is the problem. Obviously before 2014 they were carbureted after injected. Idle speed is way too high, this needs to be sorted first. Did the motor always run at this speed or is just recently. You need to pull codes from the computer and see what faults come up. Check for air leaks around inlet manifold. Spray some carby cleaner around the area engine will respond to this you’ll hear it rev up. Then it’s a process of elimination.

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On 10/19/2020 at 10:06 AM, zmk1962 said:

Idle at 1100  out of gear is definitely too high... on some other outboards you would not be allowed to shift into gear... 660-800 is where I have seen idle normally which ties into your takeoff in gear RPM.  Sounds like your timing settings are off.  There are settings that advance spark etc once you start to take off. Has any work been done on timing or on the timing flywheel recently? 

Cheers Zoran

Hi Zoran, 

No, to my knowledge the outboard has had no major previous works.

it only has 275hrs on it. I have blown out the fuel hose and priming bulb in addition to the aforementioned works.

it now idles in gear at 1200rpm.

When in neutral it now idles between 1000-1200rpm with barely noticeable fluctuations.

I might attempt to wind back the idle to 700 and see if it stall out?!

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On 10/19/2020 at 2:42 PM, Smobaby said:

Regardless  of age the question is what is the problem. Obviously before 2014 they were carbureted after injected. Idle speed is way too high, this needs to be sorted first. Did the motor always run at this speed or is just recently. You need to pull codes from the computer and see what faults come up. Check for air leaks around inlet manifold. Spray some carby cleaner around the area engine will respond to this you’ll hear it rev up. Then it’s a process of elimination.

Hi smobaby,

The outboard is a 2007 F80BET it has 275hrs on it.

I have recently purchased it and it’s has just been fitted 1.5weeks ago.

I will attempt to idle it back and double check for air leaks.

ive replaced all spark plugs, fuel line and filters.

I now have it idling in gear between 1000-1200rpm and out of gear at 1100-1200rpm.

 

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The idle is still way too high. Is the motor fuel injected or carbureted. If carbureted there are many components internally that could cause the problem.

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1 hour ago, Smobaby said:

Is the motor fuel injected or carbureted. 

Post #6 & #9

I'd be taking it to a professional to get it looked at.

You'll be back on the water quicker 😉

Edited by kingie chaser
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Hi everyone,

thank you all for taking the time to impart your wisdom on me!

I have finally fixed the issue.

It ended up being a fuel line blockage. I had cleared the hose and bulb previously, however it took a total fuel line replacement, tank drain, and fuel sensor clean to find it.

after splitting the line with a Stanley knife I found the hose had de-laminated and was restricting the flow causing a starve stall.

Still have a very minor rpm surge, but I can live with that till the next service.

cheer legends!

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3 minutes ago, Ningaloo said:

Hi everyone,

thank you all for taking the time to impart your wisdom on me!

I have finally fixed the issue.

It ended up being a fuel line blockage. I had cleared the hose and bulb previously, however it took a total fuel line replacement, tank drain, and fuel sensor clean to find it.

after splitting the line with a Stanley knife I found the hose had de-laminated and was restricting the flow causing a starve stall.

Still have a very minor rpm surge, but I can live with that till the next service.

cheer legends!

Sweet, time to get back out there fishing again 😁

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So, I was today years old when I learnt that my 4.75m tinny hydroplanes at 31knots with the new 80.

I was to scared to push it past 3/4 throttle.

Hooked a Cobia on the maiden voyage though - so that’s a partial win.

I would be back on the water without the help from all you legends.

cheers.

 

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