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Posts: 717
Location: Grand Rapids, MI | I have a '94 Mercury 115. If I have the engine all the way down, it shakes and runs really rough. Idle or wide open. If I'm trolling, I raise the motor up a little ways, and it runs much smoother. Same thing during takeoff. When I floor it from a dead standstill, I start with it all the way down, and trim it up just before I'm planed out. Any ideas? |
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Posts: 134
| My guess is that you are making contact with the transom mount of the outboard, and it is vibrating against the hull. My 4stroke yammy does the same thing while trolling. |
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Posts: 1169
Location: New Hope MN | maybe you have a fuel/oil line getting pinched..? |
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Posts: 433
Location: Cedarburg, Wisconsin | I've heard of that with other motors also. I believe it has something to do with the fuel levels in the carbs changing with the motor trim. |
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Posts: 32934
Location: Rhinelander, Wisconsin | Also, that motor is a carbed 2+2, running on two cylinders under 1800rpm and 4 over. Might need new plugs. |
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Posts: 393
Location: Hopefully on the water | Jimtenhaaf, My 04 125 did the same thing. Depending on what kind of bboat you are running you maybe able to start trimming it as it is coming out of your hole shot. I was able to do it on my Crestliner. It popped out of the water very quick like that. My dad has a Fisher with a 04 125 Merc. and it does the same shaking trimmed all the way down. Same thing start trimming the motor up as soon as the bow is starting to drop. |
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Posts: 717
Location: Grand Rapids, MI | sworrall - 7/8/2011 3:31 PM
Also, that motor is a carbed 2+2, running on two cylinders under 1800rpm and 4 over. Might need new plugs.
You know, I completely forgot it does that. I'm betting I do need a new set... I'm on 2 years with these. Usually get a new set each spring, but got lazy this year.
twells - 7/8/2011 4:38 PM
Jimtenhaaf, My 04 125 did the same thing. Depending on what kind of bboat you are running you maybe able to start trimming it as it is coming out of your hole shot. I was able to do it on my Crestliner. It popped out of the water very quick like that. My dad has a Fisher with a 04 125 Merc. and it does the same shaking trimmed all the way down. Same thing start trimming the motor up as soon as the bow is starting to drop.
Yeah, I'm able to start trimming it back up quite quickly. And the faster I raise it, the better it comes out of the hole, and onto plane. |
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Motor running differently depending on trim/tilt...