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Mercury 90 outboard transmission slipping/clunking at 3000 rpm,rpm increases with out touching throttle

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Check your prop hub. The rubber isolator is probably bad.

Posted on Jul 06, 2009

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Posted on Jan 02, 2017

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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.

Mar 01, 2018 | Mercury Cars & Trucks

1 Answer

Why does my 1999 Chevy Blazer shift really hard into second gear without the RPM's increasing like the tranny's slipping?


Shifting hard broken modulator valve on the trany itself normally there a vacuum line connected to it

Mar 13, 2015 | 1999 Chevrolet Blazer

1 Answer

Full throttle


check when its on full throttle that the carb butterfly is at 90deg and not over as this will reduce throttle but max advance on ignition !

Feb 11, 2014 | Seloc Mercury Outboard Engine Repair...

1 Answer

I have 1995 2.0L V4 Mercury Mystique that seems to make a pop noise every time I press the gas past 2000 rpm to 3000 rpm. Once it reaches 3000 rpm, it just revs up without catching any gears. It seems to...


you must reset the ignition timing to manufacter specification. Otherwise you must RUN the scanner/computer for easy diagnostic and fix it. You can faulty: ignition coil+sensor+PCM+BCM+wires spark+sparkplugs,etc see the diagram attached.
God bless you08e6b22e-6c67-4c2b-a6fd-1bdc5059652a.jpged19145e-a943-45c1-9170-b12d74cec818.jpg

Jul 09, 2013 | Cars & Trucks

1 Answer

2004 Ford Explorer transmission shift problems, O/D light flashes, engine RPM high.


Stop using it

If have been, you may have ruined it,
just driving ten miles

Have a trans shop diagnose the issues

The clunk into reverse troubles me alot

I used to own a trans shop

Mar 12, 2013 | Mercury Grand Marquis Cars & Trucks

1 Answer

Free Mercury Outboard ONLY, 2-40HP 1965-1989 Repair Manual 1-2 Cylinder, 2 Stroke


I have a problem with my 2 stroke 20hp mercury 1989,when I run 10-90% throttle it's works fine but when in 100% its only runs in 90% and doesn't sound normal like it's not burning right.

May 11, 2012 | Seloc Mercury Outboard Engine Repair...

1 Answer

2002 Mercury Cougar Squeal


Just for testing, a few seconds, will the vehicle start and run w/o the belt? Have a helper work the throttle, is the sound gone? If problem not the belt, check the belt driven accessory. Sometimes you can use a long metal rod of some kind, with belt on, one end of the rod touches accessory housing, the other end goes on that bone behind your ear, helps to magnify the sound. I guess you could use a mechanics stethoscope to do the same thing. Have helper work the throttle while you listen to each. Don't get tool or anything caught in belt. This is a serpentine belt, I haven't looked?
Maybe an accessory trying to freeze up or bad bearing? I can't think of anything else at the moment?

Mar 11, 2017 | 2002 Mercury Cougar

1 Answer

Hard shift from 1st to 2nd. Engine rpm goes to 3000.


the tranny is slipping ,,in other words its starting to go.

Jun 27, 2009 | 1996 Ford Mustang

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