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Put throttle into reverse while going fast

Old 05-05-2019, 01:51 PM
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Default Put throttle into reverse while going fast

As the title states yesterday I was out fishing when I realized I forgot to pull in the minnow bucket and my hat simultaneously flew off. In a panic I threw the throttle down (I was up on plane probably going 25-30) and It made it to reverse. The engine stalled but when I tried it again it started up and worked fine. Made it back fine and when I went out later that night it again worked fine. Today it worked for a while, but when I was coming off of plane for the second time it started vibrating or hiccuping a little. Once that happened I motored back to the dock slow.

I don't know much about boat motors and have been trying to figure out what I should be checking. So far it seems like checking/changing the lower unit oil would be a good idea.

Any advice on what I should do next would be greatly appreciated!
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Old 05-05-2019, 01:56 PM
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2 or 4 stroke?

4-stroke can swallow water thru the exhaust and hydro lock, hopefully not.
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Old 05-05-2019, 02:02 PM
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4-stroke Yamaha 115 HP.

If it was hydro locked, would it still be running?
I have gotten up on plane at 25-30mph several times since the incident, no problem. But don't wanna try now that something seems off
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Old 05-05-2019, 02:31 PM
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I did that with my 225ís a decade ago and there were no ill effects. The Yamaha system shut them down rather than allow them to go into reverse.
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Old 05-05-2019, 02:45 PM
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Itís not possible for your motor to suck water into the engine through the exhaust by abruptly shifting into reverse. Plus it still runs. Your motor has safety features that will shut down before it destroys the lower unit from accidentally shifting to reverse at high rpms. You are not the first to have done this and wonít be the last. Best thing to do for piece of mind is to drain the lower unit and check for metal. There will usually be some very fine shaving on the magnet so donít be concerned if you find some. Fill with new oil and run the piss out of it.
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Old 05-05-2019, 02:56 PM
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Don’t bother with the lower unit, it’s fine it’s the motor oil I would change RIGHT NOW,
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Old 05-05-2019, 03:02 PM
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Only likely damage would be to the vertical drive shaft pinon gear or to the clutch dog. Engine should be ok.


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Old 05-05-2019, 03:04 PM
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Originally Posted by mkalink View Post
Itís not possible for your motor to suck water into the engine through the exhaust by abruptly shifting into reverse.
This is false. While I agree that if he had done this, itís highly unlikely the motor wouldíve run well for a while, this is absolutely possible. Putting it into reverse while going forward will stall the engine out, and then the prop geared for reverse while the boat is moving can spin the engine in the wrong direction turning it into a pump up the exhaust and into the motor.
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Old 05-05-2019, 03:09 PM
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One noted cause of the 350 Yamaha flywheel / crank shaft failures came from chopping the throttles.
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Old 05-05-2019, 03:11 PM
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Originally Posted by DestinBillMe View Post
I did that with my 225ís a decade ago and there were no ill effects. The Yamaha system shut them down rather than allow them to go into reverse.
There is no "yamaha system" that shuts a motor off for any reason. Reduction in RPM for things yes but will never shut motor off.
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Old 05-05-2019, 03:25 PM
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We had a Merc ingest water. Were on plane when the high temp alarm went off. Slammed throttle shut. She died and the starter wouldn't turn the engine over. Not sure if the prop spun backwards or the extra hot exhaust sucked in water when as it cooled. Towed her in, pulled the plugs, spun her purging water until no more came out. Put in a couple new plugs...left the others out. Spun her until we got a quick hit. Replaced the remaining plugs and we were back in business.

I'd check the compression.
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Old 05-05-2019, 03:26 PM
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Originally Posted by texas 17 View Post


this is false. While i agree that if he had done this, itís highly unlikely the motor wouldíve run well for a while, this is absolutely possible. Putting it into reverse while going forward will stall the engine out, and then the prop geared for reverse while the boat is moving can spin the engine in the wrong direction turning it into a pump up the exhaust and into the motor.

what???????
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Old 05-05-2019, 04:54 PM
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Originally Posted by brownman View Post



what???????
A.) Google is your friend and this has been reported several times on here when people emergency stop.

B.) Think physics. Engage a motor in forward and drag the boat through the water... the water passing the props is going to try to spin the engine the correct direction. Same principle as push starting a car. Do the same but engaged in reverse and tow the boat forward; the water is going to try to turn the engine the wrong direction. Get enough force on the props and something is going to give. If itís in reverse and the motor spins the wrong way due to the force on the props, the cylinders are pulling into the exhaust valves instead of pushing.

Now, crash stop at speed into reverse and even though the motor stalls, water is still flowing hard over the props. If itís enough force to spin the motor, your hydro locked.


Hereís the Yamaha bulletin about it, thanks to Alloyboy in a previous post about this topic. It was an update to try to prevent the issue.




Originally Posted by alloyboy View Post

Here is a snippet from the Offshore Service Manual that even addresses the motor turning in reverse and how the engine tries to protect it from damage. Tries, but at times it can fail. It is misuse of the throttle that causes the problem. It is not a warrantable defect.

You think Yamaha just made this up for the hell of it?

And an old thread with the same argument including people who actually had it happen to them being told itís impossible. Panic stop, reverse, water sucked into engine?
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Last edited by Texas 17; 05-05-2019 at 05:10 PM.
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Old 05-05-2019, 05:29 PM
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My advice is for you to be less spastic.
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Old 05-05-2019, 05:48 PM
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Originally Posted by mitchell master View Post
My advice is for you to be less spastic.
Over a hat no less. And yes, it definitely can happen and has.
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Old 05-05-2019, 06:55 PM
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Check lower unit oil, spin props by hand in neutral. I damaged a lower unit gears on a Yam F150 doing what you did.
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Old 05-06-2019, 02:30 AM
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Originally Posted by Texas 17 View Post


A.) Google is your friend and this has been reported several times on here when people emergency stop.

B.) Think physics. Engage a motor in forward and drag the boat through the water... the water passing the props is going to try to spin the engine the correct direction. Same principle as push starting a car. Do the same but engaged in reverse and tow the boat forward; the water is going to try to turn the engine the wrong direction. Get enough force on the props and something is going to give. If itís in reverse and the motor spins the wrong way due to the force on the props, the cylinders are pulling into the exhaust valves instead of pushing.

Now, crash stop at speed into reverse and even though the motor stalls, water is still flowing hard over the props. If itís enough force to spin the motor, your hydro locked.


Hereís the Yamaha bulletin about it, thanks to Alloyboy in a previous post about this topic. It was an update to try to prevent the issue.







And an old thread with the same argument including people who actually had it happen to them being told itís impossible. Panic stop, reverse, water sucked into engine?
Are you saying we can now pop start are boats if we paddle fast enough WRONG
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Old 05-06-2019, 02:33 AM
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Originally Posted by Texas 17 View Post


A.) Google is your friend and this has been reported several times on here when people emergency stop.

B.) Think physics. Engage a motor in forward and drag the boat through the water... the water passing the props is going to try to spin the engine the correct direction. Same principle as push starting a car. Do the same but engaged in reverse and tow the boat forward; the water is going to try to turn the engine the wrong direction. Get enough force on the props and something is going to give. If itís in reverse and the motor spins the wrong way due to the force on the props, the cylinders are pulling into the exhaust valves instead of pushing.

Now, crash stop at speed into reverse and even though the motor stalls, water is still flowing hard over the props. If itís enough force to spin the motor, your hydro locked.


Hereís the Yamaha bulletin about it, thanks to Alloyboy in a previous post about this topic. It was an update to try to prevent the issue.







And an old thread with the same argument including people who actually had it happen to them being told itís impossible. Panic stop, reverse, water sucked into engine?
A friend of mine had it happen twice, once to avoid a collision and another time he hit a wave and accidentally went into reverse. Both times the engine was toast although after the first incident the engine still ran. Saying this canít happen is 100% wrong.
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Old 05-06-2019, 03:03 AM
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Originally Posted by Texas 17 View Post


This is false. While I agree that if he had done this, itís highly unlikely the motor wouldíve run well for a while, this is absolutely possible. Putting it into reverse while going forward will stall the engine out, and then the prop geared for reverse while the boat is moving can spin the engine in the wrong direction turning it into a pump up the exhaust and into the motor.

Two years ago I shifted from forward to reverse going about 30knots ..... I was trying to avoid hitting a large turtle. Both engines ( Yamaha F250ís ) hydrolocíd, port engine I broke a connecting rod that went through the block. Starboard engine restarted after 10minutes of cranking ( I assume thatís how long it took to get the water out of the cylinders) lost compression in all cylinders , went from 175-180 to all over the place. 65-120.
Fought with the insurance co for two year. Had to hire an attorney. Jerks started out with a settlement offer of $4000 for the one engine with a hole in the block and said the other engine was a maintenance issue. Two years later they paid me $26000 ...attorney fees where $2000

point do a compression check....if they arenít hitting specs call your insurance agent.

Good luck!
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Old 05-06-2019, 03:55 AM
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Originally Posted by Texas 17 View Post


This is false. While I agree that if he had done this, it’s highly unlikely the motor would’ve run well for a while, this is absolutely possible. Putting it into reverse while going forward will stall the engine out, and then the prop geared for reverse while the boat is moving can spin the engine in the wrong direction turning it into a pump up the exhaust and into the motor.
no your wrong this cannot happen the motor can only turn in one direction. Nothing that happens in the lower unit can spin the motor n the opposite direction. The water pump won’t even work if run in the opposite direction. I’m not doubting you got water in your cylinders but it did not get pumped in from you engine turning backwards.
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