Why will mercury 6hp outboard go full throttle in reverse but not in forward?

lower gear damage or shear pin on prop

Outboard won't go into reverse ?? - General Discussion Forum ' In ...

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Aug 9, 2006 - 8 posts - ‎7 authors
There's 2 cables that go into my outboard. ... It would have forward just fine but it would not shift into reverse. Assuming it's a wheel boat does the throttle handle go intoreverse but reverse doesnt work or does it not even ... Here are instructions to recover your old idofishing.com or idohunting.com account:.

Boat won't go in reverse - Lake-Link.com

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Sep 23, 2013 - 4 posts - ‎3 authors
Fishing Boards - Boats & Motors: Boat won't go in reverse. ... Forward seems to be working OK, but reverse just won't engage. ... I'm not sure if this is something at the throttle control end or something wrong at the motor. Any thoughts ... Looks like there'sa piece missing that's supposed to hold that in place.

Help! Will go in Reverse but not Forward gear! - The Hull Truth ...

www.thehulltruth.com/boating.../526873-help-will-go-reverse-but-not-f...

Jul 30, 2013 - 8 posts - ‎5 authors
Whether you're researching a new boat, or are a seasoned Captain, ... and it was notengaging fully into forward gear, but into reverse just fine. ... I'm a little dumbfounded as to why it will lock the prop when it's not running, but won't go into forward gear when it is ... While your there, change out the bellows. Mercury 125 won't go into reverse - The Hull Truth ...
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Hello, is it the external shift handle you want to replace?

Then you'll have to remove the engine block from the driveshaft housing.
To do so: Drain the engine oil.
Disconnect the throttle cable from the carburettor.
Disconnect the start-in-gear cable from the recoil starter housing.
Disconnect the fuel lead at the fuel connector
Disconnect the choke puller at the carburettor.
Disconnect the white and black wire from the stop button at the engine-block and engine wires.
Remove 6 bolts holding the engine-block to the driveshaft housing.
Lift the engineblock.
The shift lever is fixed with a M6 bolt in the front-top of the driveshaft housing. You'll need a new gasket, Part Num 803508-9

Good luck!

shift lever has a bolt in it and shift rod you need to remove powerhead complete to access also remove gearbox !

you can adjust the throttle position better than what you have described
the first forward action is the gear engagement and the at least 1/2 " lever movement before the engine starts to rev up
the same for reverse
that gives more control over the required rpms

mercury and others have a "sawtooth" cut for forward gear so the prop will rachet spin backward when dry tested, and a square clutch dog for reverse, which when it finally engages locks the prop in reverse. and will not spin in either direction.

So when you shift--- snap in in gear-- do not ease it in gear, as it will wear the dog out faster.

See if you can turn down the base idle some. Then check your gear lube, sometimes you can get an airpocket and the top end is dry. Last, if still not fixed, see if you can adjust the cables so that the throttle RPM changes after the gears do.

You want a little lag in the throttle so you don't take out a dock when coming onshore.

Hi, did you buy your engine used? Sounds like your gonna have to get the carb or carbs cleaned. Its possible you could have a stopped up fuel filter, or not enough spark but i am guessing its gonna be the carbs. They got some gunk in em i bet. Probably old fuel turned to gunk from setting up. I had the same problem on my 40 horse.

The lower gears arent hard to change, if your in there might as well get all of them there are only a few. the lshift lever does nothing but move the gears forward and back to engage forward and reverse, just pay extra attention to keep it water tight when done. A dealer should have the assembly chart for easy fix