1987 Mercury 60 HP

[stephen25]

I have no gas getting to my OB even when i prime the bulb and it gets tight the motor will not fire, if i spray a little fuel in the carbs it fires right up and continues to run like a champ. please Help

 

[mercurymang]

Re: 1987 Mercury 60 HP

Have you checked your fuel filter?

 

[Faztbullet]

Re: 1987 Mercury 60 HP

Check valve in primer bulb or check valve in fuel pump stuck....

 

[stephen25]

Re: 1987 Mercury 60 HP

Primer bulb is good, but motor boggs when i gas it hard in the water if it helps, thought it was trash in the carbs so i ran two cans of sea foam through and fogged it didn't make a difference.

 

[Maxz695]

Re: 1987 Mercury 60 HP

Few things to check is #1 the Tank vent (Make sure there is air flow) #2 The bulb may get hard but there still may be a peice of corroded fuel line or gunk blocking the jets in the carb ( Dismantle and do an inspection and proper cleaning of the carbs with berrimans liquid cleaner that can be bought at auto zone, but do not let the cabs sit for too long as it will cause a corrosive reaction to the aluminum casings and brass fittings. You can rinse with fuel oil mixture afterwards. #3 Air mixture adjustment may be too lean if it is bogging out. (Bring the mixture screws evenly out a bit at a time to achieve the best throttle advance and holeshot. Start the adjustments of all carbs at 1 1/2 turns out from a light seat then screw each mixture screw in starting with the botom one until you here the engine stumble. back out until you here the best running idle then back out another quarter turn. This is when you will adjust for best wholeshot in the water. #4 Check the fuel filter to be sure it is clear of debris. #5 Check all fuel lines and clamps to be sure of a tight fit and that the lines are in good shape. (Replace any suspected lines as ethenol will eat the hose from the inside out and partcals from beyond the filter will get into the carb bowls and sea fowm will not remove this) Just a few thoughts for you to consider

 

[stephen25]

Re: 1987 Mercury 60 HP

well what mixture should i run on the gas/oil mixture i have all ways ran 50:1, should it be richer? new to boat motors :I
and I have a 115 that slung a rod are the carbs the same size or interchangeable?

 

[Maxz695]

Re: 1987 Mercury 60 HP

I believe 50:1 ratio is proper for a 1987 2 stroke. Running a bit richer won,t hurt the engine but may fouls plugs if too rich. The carbs may look the same but the main jets may be bigger for the 115 or visa versa. You may be able to use the jets from the 60 in the 115 HP carbs though. If the venturies are different they must be moved with the jets as well. I don,t know if they are compatible so you would have to do the research on the carbs for linkages fuel bowl capacity fuel inlet fittings, and bolt to intake compatibilities. Just some info that may be of some help to you. Do you have pictures of the 60 and 115 carbs? Please post them if you can.

 

[oldman570]

Re: 1987 Mercury 60 HP

A 50/1 fuel oil mix is what the motor should take. My book shows that the 115 carbs are diffrent and will not work on a 60 hp 1987 motor. If it were a 70 hp thru 115 hpfor a 1987 motor, then they should bolt up and the timming should be reset and the jets changed out for the smaller hp motors. JMO
Oldman570

 

[stephen25]

Re: 1987 Mercury 60 HP

Thanks for the info, a question of pure curiosity how fast should the 60 hp OB push my toon it's a 20' Bass Buggy no added weight but i normally only get about 7 MPH according to my GPS and that just seems like nothing, but its pretty dead on. Don'tknow if I'm expecting too much coming from a 115 hp or what

 

[oldman570]

Re: 1987 Mercury 60 HP

MPH dose seem slow for a 60 HP motor on the toon. The setup of the whole rig depends on several factors. The weight of the setup toon,load, motor, pitch of the prop, RPM that the motor is running, heigth of the motor in the water, just to name a few. A check in the Toon section of the Forum here on Iboats might give you better info on this. JMO
Oldman570

 

[Maxz695]

Re: 1987 Mercury 60 HP

I had a 40 HP on my 17 and a half foot Bass boat and it got it up on plane and did close to 30 MPH with a 10 5/8 diamiter 12 pitch prop. You should be able to get at least that with a 60 HP on a 20 footer depended as Oldman says Weight prop pitch Q: How many people do you take out on the boat? How much euipment including coolers gear etc all are factors in WOT speed. If your rnning say a 17 pitch on that 20 footer then your straining the hell out of it and not allowing the engine to get the RPMs nessecary to turn the prop. Using a smaller pitch such as a 12 P may let your engine turn faster and give you more power to get up on plane and go go go. Your not by chance using the 115 prop on that 60 HP I hope. The pitch will be way to great for that little engine. If your saying your 115 only gets 7 MPH @ WOT then you have some serious issues. Lack of fuel Carbs not working or adjusted properly Firing issues Internal issues Check compression must be above at least 100 psi on all cylinders Must not vary more than 15 PSI bewtween cylinders. Vavle reeds may be leaking and not getting proper fuel nessecary to run the engine properly as well as other electrical issues. Narrow it down.

 

[stephen25]

Re: 1987 Mercury 60 HP

OK let me do some checking, thanks for the information and I will get back with everyone thanks a gain