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
Motorguide 46 TM