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Anybody on here an outboard motor mechanic

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Old 03-07-2011, 01:56 PM   #1
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Anybody on here an outboard motor mechanic

have a problem with an 07 mercury 50 2 stroke.as long as you dont go past 3/4 throttle its ok,but push it any further and within 15 sec it will shut off just like you turn the switch off,then when you try to start it back, starter will click for about 15 sec(but no start),like the motor is locked up.then after 15 sec or so it will start up and do the same thing all over...anybody help?
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Old 03-07-2011, 02:03 PM   #3
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I wish I could help but I dunno shit about boats... isn't the engine the same only difference being the drive components and intake.... nevermind, the more I think about it the less they have in common. Free bump
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Old 03-07-2011, 02:09 PM   #4
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impellor?
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Old 03-07-2011, 02:12 PM   #5
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coil? Sounds electrical
yeah,we think its electrical to,and it has 3 coils....
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Old 03-07-2011, 02:19 PM   #6
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shut off at full throttle then takes forever to start up almost sounds like your flooding the engine with fuel to me... does it sputter start during those 15 seconds before it catching?
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Old 03-07-2011, 02:22 PM   #7
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Originally Posted by BrokenTusk View Post
shut off at full throttle then takes forever to start up almost sounds like your flooding the engine with fuel to me... does it sputter start during those 15 seconds before it catching?
no.......it just shuts off like you turn the key off.then the starter just clicks for about 15 sec or so,like the solenoid is kicking in,but not turning the motor.then after a few sec it will start back up like a new motor.
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Old 03-07-2011, 02:37 PM   #9
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yeah,its a friend of mines boat and he's already on that site,but nobody knows yet
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Old 03-07-2011, 02:42 PM   #10
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Did you call the loca dealer and talk to the service guy? That usually is my first call.
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Old 03-07-2011, 02:45 PM   #11
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Did you call the loca dealer and talk to the service guy? That usually is my first call.
he did that this morning.local mercury dealer says they have never seen one do that.its only has about 50 to 75 hours of run time to....
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Old 03-07-2011, 02:48 PM   #12
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I'll ask around.. Our lakes are still frozen, but guys are getting the boats ready to go for the opener
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Old 03-07-2011, 02:49 PM   #13
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I'll ask around.. Our lakes are still frozen, but guys are getting the boats ready to go for the opener
thanks dude
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Old 03-07-2011, 03:02 PM   #14
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I think it's either fuel starvation or blocked cooling water flow, here's my reasoning:

Known:
1) Engine operates normally under less than 3/4 throttle indefinitely
2) After a short burst of full throttle it shuts down and will not re-start for a short period

Chain of events:
1) Engine is operated at less than 3/4 throttle, fuel flow and/or cooling water flow is sufficient - engine operates as normal
2) Engine speed is increased to above full throttle, after a short time the fuel delivery system cannot keep up with demand causing a lean running condition (two strokes need fuel to get oil) causing excess heat and piston/ring seizure OR after a short time the cooling system is not keeping up with the heat the engine is making causing heat build-up and piston/ring seizure.

Things to check:
1) Is the fuel tank properly vented?
2) Is the fuel filter clogged / main jet in carburetor clogged / float valve in the carburetor malfunctioning
3) Is the thermostat operating properly (test in hot water bath)
4) Is there a blockage in the cooling system?
5) Is the waterpump impeller in the process of failing / failed?
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Old 03-07-2011, 03:04 PM   #15
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Quote:
Originally Posted by MassTaco View Post
I think it's either fuel starvation or blocked cooling water flow, here's my reasoning:

Known:
1) Engine operates normally under less than 3/4 throttle indefinitely
2) After a short burst of full throttle it shuts down and will not re-start for a short period

Chain of events:
1) Engine is operated at less than 3/4 throttle, fuel flow and/or cooling water flow is sufficient - engine operates as normal
2) Engine speed is increased to above full throttle, after a short time the fuel delivery system cannot keep up with demand causing a lean running condition (two strokes need fuel to get oil) causing excess heat and piston/ring seizure OR after a short time the cooling system is not keeping up with the heat the engine is making causing heat build-up and piston/ring seizure.

Things to check:
1) Is the fuel tank properly vented?
2) Is the fuel filter clogged / main jet in carburetor clogged / float valve in the carburetor malfunctioning
3) Is the thermostat operating properly (test in hot water bath)
4) Is there a blockage in the cooling system?
5) Is the waterpump impeller in the process of failing / failed?
thanks, i'll print this off and give it to him
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Old 03-07-2011, 03:41 PM   #16
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sounds to me like, there is a wire or cable getting cut off to the full throttle. thats really weird. maybe there is a wire or something for the cut off switch? and also sounds like it might be getting too much gas, or not enough. does it just suddenly stop running or bog down then quit?
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Old 03-07-2011, 03:47 PM   #17
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James.....start with the carburetor. sounds more like a fuel related incident that electrical...to me anyway. pull the carb(s) check the jets and all...check fuel pump to make sure its pushing fuel, and change the fuel filter if it hasnt been changed. sounds a bit like old gas may have set up in there some too.
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Old 03-07-2011, 03:49 PM   #18
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yep, the new motors dont like the ethanol..Change the fuel filter, and pull the carb to check high speed jet
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Old 03-07-2011, 03:53 PM   #19
With sufficient thrust, pigs fly just fine.
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Another thing you may want to check out.....On mine, there is a switch, I guess its supposed to cut the engine if the boat flips over. Anyway, Same thing happened to me one time out, and my buddy suggested I give the housing its in a "few flicks" with my finger. Its been great ever since.
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Old 03-07-2011, 04:39 PM   #20
I support a velociraptor free workplace.
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Quote:
Originally Posted by chris4x4 View Post
Another thing you may want to check out.....On mine, there is a switch, I guess its supposed to cut the engine if the boat flips over. Anyway, Same thing happened to me one time out, and my buddy suggested I give the housing its in a "few flicks" with my finger. Its been great ever since.
I did that to fix the starter solenoid on my old motorcycle, It started messing up again a year later, a 16mm wrench solved it that time...
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