1973 evinrude 65hp issues....

[nos10racer]

i posted this in a diff thread but figured i would get a few more responces here. just got back from the boatin. lil frusterated... it starts right up pull away from the dock then when i give it full throttle she stumbles for a sec then planes out for a mile or so then bogges out.... never dies or leaves me stranded always stay runnin. but i can put in in nuteral and rev it up a few times then put it in gear and hammer it will plane out for 10-15 sec then bogg out again. it seems fine in nutral when i free rev it but when it goes in gear she will want to come out the water then just bogges.

it has done this the last few times i went out since then i put in new plugs. some water dryer fuel additive. (yet to install a separator) did comp test and the cyls are all 120.

i did do a search for my motor code and after 3 pages of reading it seems like no one seemed to have the same problem i am having....

is carbs the next thing i should do ? i read on here i need a special tool. know where to get it ?

 

[DargelJohn]

Re: 1973 evinrude 65hp issues....

From your description, under a load, sounds like it's starving for fuel.

Next time you are out and it acts up, look at the primer bulb. Is it going flat? If so, then try cracking open the fuel tank cap. Could be a plugged vent.

If the primer bulb does not go flat, try pumping the bulb and see if it runs better. Bulb may be bad or fuel pump problems.

Old fuel lines can collapse inside, causing fuel restrictions.

Where is the fuel filter in your fuel system? Should be this progression: Tank>>Filter>>Bulb>>Engine

 

[nos10racer]

Re: 1973 evinrude 65hp issues....

mine goes tank bulb then filter. and the fliter always looks half full. if i pump the bulb it fills up then it sucks it down to like half again after it runs for a second

 

[DargelJohn]

Re: 1973 evinrude 65hp issues....

Gas level in the filter sounds normal. The reason for the (Tank>>Filter>>Bulb>>Engine) is to catch dirt before it gets to the bulb. Does the bulb go flat at full throttle?

 

[nos10racer]

Re: 1973 evinrude 65hp issues....

not that i know of. i will check next time.

i have a lillte 3psi electric inline fuel pump could i use it to help it get fuel i wonder ?

 

[nos10racer]

Re: 1973 evinrude 65hp issues....

here my plugs from right to left they are 3.2.1


i am assuming the #3 is the cyl having issues. i just did another comp test they are all 120+

 

[F_R]

Re: 1973 evinrude 65hp issues....

Are you sure water isn't getting into #3 cylinder? That year/model was rather bad about that. Gasket failure due to exhaust cover warpage. It will destroy the powerhead if allowed to continue.

 

[nos10racer]

Re: 1973 evinrude 65hp issues....

Are you sure water isn't getting into #3 cylinder? That year/model was rather bad about that. Gasket failure due to exhaust cover warpage. It will destroy the powerhead if allowed to continue.

i dont know... how can i tell ? why would it wait till a mile out ? how would it blow such good comp it that was the case ?

sorry just new to boats but really want to learn : )

 

[Randybeall]

Re: 1973 evinrude 65hp issues....

Number three cylinder has a problem. First step is a compression test. An inexpensive push in the plug hole type of guage is fine. Pull all three plugs, ground the spark wires, open the throttle fully. Crank the engine with the guage held firmly in the hole for about 6 pulses. Record each reading. They all should be within 10psi and over 100psi. If not good you have internal engine problems. If good I would suggest the #3 carburator may have a pulgged jet or stuck needle and seat. The leaking head gasket is possible and would be something you would have to inspect the piston tops to be sure of. Use a bright flashlight and rotat the engine till each piston comes up to the top. If 1 and 2 are black with carbon and 3 is clean alumnium you have the water problem. Hope this gives you some where to start.

 

[nos10racer]

Re: 1973 evinrude 65hp issues....

Number three cylinder has a problem. First step is a compression test. An inexpensive push in the plug hole type of guage is fine. Pull all three plugs, ground the spark wires, open the throttle fully. Crank the engine with the guage held firmly in the hole for about 6 pulses. Record each reading. They all should be within 10psi and over 100psi. If not good you have internal engine problems. If good I would suggest the #3 carburator may have a pulgged jet or stuck needle and seat. The leaking head gasket is possible and would be something you would have to inspect the piston tops to be sure of. Use a bright flashlight and rotat the engine till each piston comes up to the top. If 1 and 2 are black with carbon and 3 is clean alumnium you have the water problem. Hope this gives you some where to start.

thanks for the responce i really appreciate it !! so the compression reads as follows (cyl 1 120) (cyl 2 122) (cyl 3 124) and when the plugs where out i took a flash light and they are all the same black color ! so i guess thats a good thing !! lol i will fix what ever it is i just need to know what it is lol haha : )

 

[nos10racer]

Re: 1973 evinrude 65hp issues....

starting on the carbs right now

 

[nos10racer]

Re: 1973 evinrude 65hp issues....

ok just finished the carbs didnt really see anything that could be the cause... #3 bowl was a lil dirty but didnt see anything in the jets after i removed the....

hope this fixes the problem......getting frusterated (spelling?)

 

[dew2]

Re: 1973 evinrude 65hp issues....

You might look for air leaks in the fuel lines even under the cowling,Its old enough to maybe replace the inlet to pump and the fuel pump out to the carb.Even so that doesnt leave out the tank to motor inlet

 

[nos10racer]

Re: 1973 evinrude 65hp issues....

this is driving me nutts.... still not fixed..... should i just replace the side cover gasket ?

 

[whiskers]

Re: 1973 evinrude 65hp issues....

I see that you last posted 2 months ago and on seeing the pics you have put up of the plugs you are def getting water into the system some how, I put on a fuel seperator filter, this is where the fuel goes in and the water drops to the bottom of the conatainer (it looks like a oil filter). I have put it between the bulb and the engine I have also made sure that the fuel pump is good I also took the quick release off, (but thinking about putting it back again. and have never had any probs after I done those few things. also is you bulb hard or soft? they should be soft and then go hard after you pump it up. I would give that a go and see if any difference is happening.

good luck with it mate.