Question about Light Outboard Motor Boat Bass Fishing Saltwater Base

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20 hp Boat motor wont turn over

After using the boAt, the motor was not flushed through as we were camping. After three days after use, tried to flysh and run the motor.. But it wont start. Plx help

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  • Light Master
  • 44,351 Answers

I WOULD CHECK FOR SPARK . perhaps there is a kill switch on lanyard that needs attached .

Posted on Jan 02, 2013


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Posted on Jan 02, 2017

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SOURCE: 75 mercury boat motor not turning over

you have one of two problemsyour starter brushes are sticking or your solenoid is going bad next timme it happens take a hammer and lightly tap the starter if it turns over your starter is going bad if you try this repeatly and nothing then you have a bad solenoid they are not expensive if you do not want to tap the starter then just replace the solenoid the best way to find it is follow your main battery line to motor where it stops and breaks with two posts and then the hot goes to the sarter take a picture of it so if you need to take it with you u acn see where the wires go oriellys probally will have it is round and you battery will go to one post and the hot to the starter will go to the other there will be to little posts on it as well one to the key switch and the other is a groud

Posted on Jun 30, 2009

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SOURCE: my yamaha outboard will not shut off?

Check that the ignition swith is grounded.

Posted on Oct 08, 2009

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SOURCE: yamaha 1998 25 hp 3 cylinder outboard pistons hitting spark plug

This must have the wrong plugs in the motor.The gap between the top of the piston and the plug is about 8-10 mm.No motor will run with any bearing that is that worn.You said you looked at the top of the piston.With the head off,did you check how far the spark plug extended through.The reason being,is that it should not protrude all the way into the combustion chamber.It must have the wrong length plugs in it.If it runs well,you have the heat right.Mate.Hope this helps

Posted on Oct 09, 2009

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SOURCE: how to clean boat carburetor

Carburetors are tricky, They have to be completely dismantled, soaked in carb cleaner, make sure all the gunk is off, every jet clean and clear, If you can't get a wire through it, you won't get gas through it, make sure you can blow through it, Get some guitar strings, .009 is about the smallest guitar string you will find, you can buy them separately at the music store if you don't have one. Change the filter in the line, when the carbs go back on, the adj all have to be the same, not one wide open and 2 idleing, Float level is also important, they don't sell complete kits anymore, you have to buy the parts individually, gaskets , etc, good luck.

Posted on Feb 14, 2010

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SOURCE: Boat does not plane

you could try a lower pitched prop.2" would up the revs by 400 revs.,which would up the revs ,but give you more low down thrust,and/or tucking the motor under more[if you have electric trim/tilt].thats a big boat and fair bit of weight for a 40hp merc is on a 13ft saracen,and with two of us it takes a while to get i bought a ProPulse prop,with adjustable pitch.been god to try different pitches

Posted on Jul 10, 2010

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Maxim 20'7 boat with a cuddly cabin and a 120 horsepower Mercury force outboard engine. What is the weight of this boat?

if you cannot get the details from the manufacturer of the boat and it is not on the compliance plate that should be attached to the boat( plate shows length, max hp motor to be fitted , registered no of passengers possible ,weight etc ), the only thing left to do is to put it on a trailer that is big enough and have it weighed at a public weigh bridge /station
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Hi i just bot a bass boat with a 40 hp mercury motor that has ben sitting up for 8 or ten years. so what should i do before i try to start it again because it wont start at all

First know that they have a neutral safety switch which will stop the motor from spinning if the gear is engaged. so put it in neutral first.

Second- will it even go round? take the hood off and try to spin it by hand. Just to see if it is free. If it is stuck, check the lower unit oil for a lot of rust and water. That will stop it too.

Next - charge or change the battery,

Take the spark plugs out and see if there is any compression, or are there metal pieces found on the spark plug?

Then- or first- buy a book on your motor and a general book on boating.

Practice un-tying the boat and moving it off the trailer at home so you don't look like a novice at the ramp.

After 5 years the water pump should be serviced- use a garden hose and flush attachment or trash can full of water when running it at home- don't forget to put oil in the gas.

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20 hp evinrude boat motor will not start

I usually don't recommend starting fluid but some brands have oil with them. You may have to dry the cylinders by getting them to fire with starting fluid.
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You should drain the carbs, drain the fuel line and gas tank.

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