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Hello All, I'm new to the forum but searching for a place to help me diagnose some issues with my motor.
I have a 1995 C85 Yamaha Outboard. I purchased it about a 1 1/2 years ago, but it sat on a shelf until a couple of months ago at which time I put it on my boat. Since installing it, I've performed some basic maintenance tasks: cleaned the carbs, replace thermostat and gasket, replace water pump and housing, changed the foot oil, replace spark plugs, and replace in-line fuel filter. On my list of things to do is replace the head gasket, which is leaking a little bit of water along the edge in one spot between the upper and middle cylinder.
However, the motor just loses power spontaneously, then regains power (most of the time) by simply restarting the engine and revving it up. For example, yesterday, we would be cruising along nicely when it would just lose nearly all power and start to shake terribly. When I try to rev it in neutral, it goes up very little and shakes. In this case, simply restarting the engine and revving it in neutral usually does the trick. Sometimes, when I'm trying to get underway, it just simply lacks any power. In those cases, it may operating with little power, then spontaneously gain power, then lose, then gain, etc.
My first inclination is that this is a power (electrical) issue. I'm pretty mechanically inclined, but when it comes to electrical matters of this nature, I don't do so well because its just so difficult to nail down the problem.
I welcome any thoughts on what might be causing these problems. I just think its electrical, but I may be dead wrong. Anyone else with any experience like this? Thanks in advance for your comments.
seth
I have a 1995 C85 Yamaha Outboard. I purchased it about a 1 1/2 years ago, but it sat on a shelf until a couple of months ago at which time I put it on my boat. Since installing it, I've performed some basic maintenance tasks: cleaned the carbs, replace thermostat and gasket, replace water pump and housing, changed the foot oil, replace spark plugs, and replace in-line fuel filter. On my list of things to do is replace the head gasket, which is leaking a little bit of water along the edge in one spot between the upper and middle cylinder.
However, the motor just loses power spontaneously, then regains power (most of the time) by simply restarting the engine and revving it up. For example, yesterday, we would be cruising along nicely when it would just lose nearly all power and start to shake terribly. When I try to rev it in neutral, it goes up very little and shakes. In this case, simply restarting the engine and revving it in neutral usually does the trick. Sometimes, when I'm trying to get underway, it just simply lacks any power. In those cases, it may operating with little power, then spontaneously gain power, then lose, then gain, etc.
My first inclination is that this is a power (electrical) issue. I'm pretty mechanically inclined, but when it comes to electrical matters of this nature, I don't do so well because its just so difficult to nail down the problem.
I welcome any thoughts on what might be causing these problems. I just think its electrical, but I may be dead wrong. Anyone else with any experience like this? Thanks in advance for your comments.
seth
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