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1990 mercury 150 outboard motor

When I push the lever forward it does not make the boat go faster but while in nuteral i can make the idle go faster but not while it is in gear. also the buzer just started going off with short blasts. I know that that means oil though.

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Sound like the throttle control (lever) is at fault not engaging the throttle in FWD position, but ok when in neutral, check the release button insure it pops out to lock the throttle...hope this helps...GL

Posted on Jul 06, 2009

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many mercury motors use a rubber mounted prop on the shaft which is a sacrificial idea to prevent gear box damage and prop damage in with under water objects
what you suggests indicates that at certain load situations that rubber has failed and allowing the shaft to turn but is not driving the prop as required
It is driving just enough to give you steerage to get home

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FourStroke 150 hp - Mercury Marine

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1995 mercury 150 horse runs great idols great but very slow .when put in reverse quits seems like to slow idol . what screw do i turn for fast idol


Seems like your are describing a outboard motor. If so, the Boat section of Fixya may have more experts that you need. You would want to avoid turning any screws on the carburetor body. The externals on the linkage have some adjustments like throttle stops.

The linkage on boat shift mechanisms are tempermental. They usually combine 2 functions on 1 control lever. They are synchronized that when the transmission shifts from neutral to forward and neutral to reverse the idle speed is low. This keeps the gears from grinding and takes the shock out of the shifting process.

Another thing different than on a car engine is the effect of the propeller on engine rpm. You can change the "in gear"
rpm for both directions by changing prop size and/or pitch.
This also means you can over-rev the engine by having the wrong prop on the boat. There are engine rpm "stops" for the high end too, but some just rely on using the correct prop. As what you may be experiencing with a "stall" can be brought on by

A word of caution. The inboard/outboard engines can have the same problem as outboard engines. The shift levers are synchronized with a pivot system and adjusting the throttle can interfere with the shifting.

You may be able to view youtube videos by searching for these topics.

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Is there any way to switch anything around in the control box in an outboard motor to make it pull instead of push the throttle lever on the side of the motor to make the motor accelerate?


Good Afternoon Ronnie Barnhouse,
Most Control Boxes Are Able To Be Switched,
Mercury Control Boxes Require A Lever To Be Purchased To Turn It Into Push Or Pull For Throttle. If You Would Like Specific Instructions Please Let Me Know The Type Of Control Box Or Post Photo.
Hope This Helps
Regards
Gordy

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