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Dec 30th, 2023
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 Motor "lurching" around 5000 rpms
#3176799
03/01/09 04:31 PM
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Joined: Mar 2007
Posts: 180
Catch32
OP
Outdoorsman
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OP
Outdoorsman
Joined: Mar 2007
Posts: 180 |
Boat/motor have no problem getting on plane and then when I hit about 5000 rpms, the boat lurches forward like the motor is getting more power and then it backs off. If I keep it steady at 5000 rpms it will do this regularly, and anything under that it does not do it at all. Not really sure what is causing this, any ideas?
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Re: Motor "lurching" around 5000 rpms
[Re: Catch32]
#3177905
03/01/09 11:36 PM
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Joined: Jun 2004
Posts: 1,509
OPTI
Extreme Angler
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Extreme Angler
Joined: Jun 2004
Posts: 1,509 |
Sounds like a fuel problem such as fuel pump or possible collapesed fuel line if it has the gray fuel line I would check that for sure or even a anti siphon valve at fuel tank....OPTI
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Re: Motor "lurching" around 5000 rpms
[Re: OPTI]
#3178858
03/02/09 03:44 AM
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Joined: Jul 2007
Posts: 688
NITRO Z8
Pro Angler
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Pro Angler
Joined: Jul 2007
Posts: 688 |
Opti, I see you know alot about mercury outboards? My question is what is the red linning on a mercury 150hp and it's carburated. I put a 4 blade prop on it for a spare and at 5200 rpms it running 54mph and with my 3blade prop at 55rpms it will run at 60mph. I don' want to red line it if i can help it thats why im wondering what the red line rpms are for that moter? Thanks for your help.LWC
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Re: Motor "lurching" around 5000 rpms
[Re: NITRO Z8]
#3179440
03/02/09 12:49 PM
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Joined: May 2003
Posts: 11,586
gary purdy
TFF Guru
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TFF Guru
Joined: May 2003
Posts: 11,586 |
It always helps to know what motor you guys are running. Anytime you have surging, you better get it fix quick because it is an indication of a lean fuel condition and the next surge may be its last.
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
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Re: Motor "lurching" around 5000 rpms
[Re: gary purdy]
#3179727
03/02/09 02:38 PM
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Joined: Jun 2004
Posts: 1,509
OPTI
Extreme Angler
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Extreme Angler
Joined: Jun 2004
Posts: 1,509 |
On a carberated 150 range is 5000 to 5600 and it sounds like your right in that range.....OPTI
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Re: Motor "lurching" around 5000 rpms
[Re: gary purdy]
#3179733
03/02/09 02:39 PM
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Joined: Dec 2002
Posts: 3,826
Tommy Yetts
TFF Team Angler
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TFF Team Angler
Joined: Dec 2002
Posts: 3,826 |
You can run your 150 Mercury 5700-5800 rpms without any problems. Like the other two guys said you must have a fuel delivery problem.
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Re: Motor "lurching" around 5000 rpms
[Re: Tommy Yetts]
#3183370
03/03/09 04:48 AM
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Joined: Feb 2008
Posts: 2,481
snowyriver6
Extreme Angler
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Extreme Angler
Joined: Feb 2008
Posts: 2,481 |
could it be something with the prop coming out of the water
Last edited by snowyriver2; 03/03/09 04:49 AM.
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Re: Motor "lurching" around 5000 rpms
[Re: snowyriver6]
#3184165
03/03/09 02:24 PM
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Joined: Mar 2007
Posts: 180
Catch32
OP
Outdoorsman
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OP
Outdoorsman
Joined: Mar 2007
Posts: 180 |
Thanks for the replies. I'm pretty sure its not the prop coming out of the water. I will start with the fuel lines, fuel filter, and spark plugs, then the fuel pump. I guess start with the easy stuff first! By the way its a 1990 Merc 200 hp XR6.
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Re: Motor "lurching" around 5000 rpms
[Re: Catch32]
#3186542
03/03/09 10:49 PM
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Joined: Oct 2005
Posts: 6,844
dallasdawg
TFF Celebrity
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TFF Celebrity
Joined: Oct 2005
Posts: 6,844 |
I had the exact same issue this fall with my Yammy...same symptoms and all. I had a collapsed fuel line.
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