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I like to think I have gotten handy working on Yamaha outboards from owning several of them, but this one has me stumped.
I have a 1996 Yamaha 250hp that was in storage for 6-8 years. Good compression, new fuel off an external tank, new fuel pumps and filters, and cleaned carbs. Motor starts and idles, but will no go above 2800rpms, its like someone hits a switch, but accelerates to that point. I at first thought it was the TPS with no luck and also the temperature sensor tested ok following the steps in the book.
Someone told me it sounded like it was in limp mode. No alarms, motor is not overheating, main oil tank if full and the motor is getting oil (with the motor sitting for so long I have 50:1 in the external tank also but I can see the oil injection in the intake). Is there a separate sensor for the oil system to place it in limp mode that is not the float? The lights on a gauge read normal.
Thanks for the help
Andrew
I have a 1996 Yamaha 250hp that was in storage for 6-8 years. Good compression, new fuel off an external tank, new fuel pumps and filters, and cleaned carbs. Motor starts and idles, but will no go above 2800rpms, its like someone hits a switch, but accelerates to that point. I at first thought it was the TPS with no luck and also the temperature sensor tested ok following the steps in the book.
Someone told me it sounded like it was in limp mode. No alarms, motor is not overheating, main oil tank if full and the motor is getting oil (with the motor sitting for so long I have 50:1 in the external tank also but I can see the oil injection in the intake). Is there a separate sensor for the oil system to place it in limp mode that is not the float? The lights on a gauge read normal.
Thanks for the help
Andrew
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