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#12827278 - 07/13/18 02:48 PM Help with motor running weird
CWCW Offline
Extreme Angler

Registered: 04/14/08
Posts: 1767
Loc: Joshua, TX
2008 50hp Mercury ELPTO 2 stroke carb motor on a tracker pt170tx is the motor. Motor hadnít been started in about a year when I first tried to crank it earlier this week. The motor started like normal with a couple cranks of the starter and idled almost normally with a little hesitation every few seconds or so. As I apply throttle to it, it will run up to about 2000 rpms or so but will run rough and if I give more throttle than that it will run rough and try to fall on its face until I pull back the throttle. I have all new gas from an empty tank with Seafoam added, I have changed the fuel filter and the plugs with no change in the way it runs. It feels as though one of the plugs may not be firing but it also seems Like the symptoms point towards it not getting enough gas to rev like it needs and then gets too much air as I apply more throttle and too lean on fuel causing it to fall on its face. I am going to attempt to verify that it is getting a spark on all three spark plugs by checking to see if each plug will spark outside of the cylinder head while someone cranks the starter to see if I have a bad coil on one(not sure itís called a coil pack but itís the little box each spark plug wire comes out of before connecting to the plug). Am I going in the right direction here? Iím pretty good with working with carburetors in tractors/lawn mowers and things alike even though this is the first boat motor I have worked on besides regular maintenance. Also, the tachometer does something weird when putting around in the boat at around 2000 rpms, the tach will move and bounce from 2000 up to 3000 or to 3500 rpms. These bounces in rpm are not actually occurring at the motor. Ideas would be appreciated before I start to tear into the next speculated problem. Thanks!
_________________________
2009 Tracker PT 170 TX
Mercury 50hp
Lowrance X125
Lowrance X50
Motorguide 46 TM

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#12827870 - 07/14/18 05:37 AM Re: Help with motor running weird [Re: CWCW]
sandjohnny Offline
TFF Celebrity

Registered: 01/22/06
Posts: 6128
Loc: Azle,Tx
If it sit for a year carbarators need work.
Johnny
_________________________
http://www.johnnysguideservice.com 8174441286 or 8175976598
Creator of OLE UGLY SLABS johnnystevens@1scom.net

OLE UGLY SLABS GO TO www.johnnysguideservice.com
Fish with the Guy who invented the OLE UGLY slab

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#12828110 - 07/14/18 11:00 AM Re: Help with motor running weird [Re: CWCW]
Alumacraft 14 Offline
Angler

Registered: 02/24/06
Posts: 324
Loc: Texas
Sounds like a fuel issue to me, most likely the carbs need a cleaning.

1st make sure there is no restriction to the fuel system, clogged line etc.

2nd test the fuel pump, by pumping the primer bulb while increasing rpm, if the motor runs smooth while doing this, pump is bad.

3. Inspect the carb, clean as needed.

Get a spark tester for the coil packs. Grounding the plug while it is outside of the cylinder for a spark test, can cause a fire. Have a extinguisher handy if you attempt that

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#12828125 - 07/14/18 11:22 AM Re: Help with motor running weird [Re: Alumacraft 14]
CWCW Offline
Extreme Angler

Registered: 04/14/08
Posts: 1767
Loc: Joshua, TX
Didnít get a chance to check coils last night but itís on my top of the list to do first. Really helpful info about how to check to see if the pump is working by using the primer bulb, because I had read earlier that the pumps can fail and cause problems.

Just trying to narrow down and eliminate the easier to get to items first before I take the carbs off and clean them.
_________________________
2009 Tracker PT 170 TX
Mercury 50hp
Lowrance X125
Lowrance X50
Motorguide 46 TM

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