Question about Light Outboard Motor Boat Bass Fishing Saltwater Base

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Motor will coast along well when idling but when given full throttle seems to jump out of gear. it justs revs but no forward motion

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  • Anonymous Mar 23, 2009

    I have a Evinrude 25hp. Its starts fine but moves forward with low revs but as soon as i give it a little more throttle it seems to jump out of gear and go no where. It just revs really high and loses all forward movement. I took it to a marine shop and they replaced the shear pin and they said the gears are fine. It still does it and i cant find the problem

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It is most likely your shift adjustment is only putting a little in gear and it jumps out under load. If this has been the case for a while it will ruin the clutch dog and possibly the gear.

Not knowing which engine you have - thats as much advise as I can give.

The "Cavitation issue" mentioned can be checked with how deep in the water the engine sits. And just watch the prop under way and if it disappears in a ball of bubbles and quits pushing the boat , you will need to adjust the tilt first then the depth in the water.

Posted on Jul 29, 2012

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I hate to give you bad news but it sounds like a cavitation problem, i had this problem on my 150 mercury. i t turned out to be a bent propeller shaft it could also be a bent prop
pull it out of the water and spin it. also push and pull on the prop and see if the berings are loose
hope this helps and good luck with it

Posted on Jul 09, 2009

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1 Answer

MOTOR WILL NOT EXCELERATE WHEN IN GEAR


More likely a fuel problem. Tap the choke when you put it in gear and see if it picks up. If so your idle mix is to low or you throttle link is picking up to soon.

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150 johnson wont idle wot great


start engine while in water with slightly high tickover , remove throttle cable and find throttle stop screw and adjust till 800rpm holding the throttle arm against the stop and see if you can select forward gear without stalling ! depends what size pitch prop your using as you mite need tickover slightly higher but as long as it selects without stalling then ok ! as long as it doesnt jump forward , in gear should be 800rpm + or - 100 max ! if still stalling then possible requires fuel system cleaning !

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1987 200hp evinrude will not go in reverse grinds but won't engage all the way. goes into forward and neutral just like its supposed to. seems that cables and linkage are moving like they should.


The gear change control cable has stretched and needs adjusting.Remove the engine cowling and with the motor NOT running,get someone to work the hand throttle/gear lever.Whilst they are doing this,you watch what happens at the engine.2 cables.One is for throttle and the other for gear change.Look at the direction the gear cables move when changing from fwd to rev.The next step is to run the motor and use the lever.Like you are flushing the engine.BUT!!!!!Be up in the boat.The prop will be in drive and can cut your legs off.Have all people well clear.With your helper using the gear change,get them to put the engine in reverse while you watch the cables.As it starts to grind you should manually help the cable by pushing the lever on the side of the motor with your hand.It should drop into gear cleanly.Do this a few times so you get familiar with the movements.A close look and you will see how to adjust the cable just where it is bolted to the side of the engine.It will have a plate or clip to undo and you then spin the locater along the threaded part of the cable.Hope this helps

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1 Answer

I have a 1970's 25hp Johnson outboard motor. Last


Hello Adam.
If your propeller is OK, your lower unit will need some repair. It may be as simple as a clutch dog worn and not engaging the gear. Usually they give warnings of problems by jumping out of gear though.
Other possibilities are broken driveshaft, propshaft, or gears. If it goes into reverse the shafts are OK and the clutch and forward gear become suspect.
It was common for these engines to break at the top of the driveshaft where they were tapered.This would give you no motion at all and no previous warning of a problem.
Check the gear lube for metal particles and signs of water intrusion. I hope your repair is an easy one.

KL

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1 Answer

35hp Johnson evinrude outboard not running at full potential


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.

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1 Answer

Our 40 Merc Won't open all the way up under load.


A couple of possibilities are the spark advance and the fuel line. Carburetors can do it as well as a clogged screen on the fuel pump. So can a bad coil.

Look for electrical parts under the flywheel area of the motor. When you move the throttle there should be movement of the stator to advance the spark. Check for binding wires or disconnected linkage.
See if the spark is jumping strong to the plugs for coil strength or have it tested.
Check fuel pump screen and diaphram.
Before messing with carbs-disconnect cables for throttle on boat. Work by hand directly at motor. You may have cables restricting movement.
Thats about all I can think of. Let us know of outcome.

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2 Answers

I have a 1994 Yamaha 40 HP 3 cylinder 2 stroke engine starts and runs fine in neutral try to accelerate under load and it only will pull about 2800-3000 RPMs and wont go any faster it will rev fine in...


Reving in neutral does not mean the same thing as under load. If you need to pull 4500rpm under load and for an instant the load was gone, you would probably overrev to 6500. With the cover off and motor not running move the throttle to full forward. Look at your carbs and see if the throttle plates are wide open. If they are not all wide open take it back to the dealer. The throttle adjustment is off. You need the full range of travel from idle to topend.

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1 Answer

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there are two sets of cables coming from your control box. Onne of the cables switches you from foward/neutral/reverse, and the other cable is for the throttle. either you've have some linkage come loose on your throttle cable, of the cable has broken inside the plastic tube it's housed in.

Jun 22, 2009 | Boating

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