1972 25hp rude spitting and sputtering

[Bohogin]

i recently came into a 25hp evinrude outboard cranks fine runs fine for a few min. then starts to sputter and smoke (smokes looks blue). oily film in barrel when i cut it off what could be the problem?

 

[mikeyzx2]

Re: 1972 25hp rude spitting and sputtering

sounds like it flooding, probably good idea to rebuild the carb and make sure the float is adjusted correctly. the oily film is normal but it may be a little excess that's not burning

 

[Bohogin]

Re: 1972 25hp rude spitting and sputtering

thanks mikeyzx2 .i have one more question the lean adjuster may not be right how would i go about setting it back to the proper position?

 

[laurincole]

Re: 1972 25hp rude spitting and sputtering

hello, I have the exact same engine and have had the exact probelm in the past. Mikey is right, carb probably needs to be adj. As far as the lean adjuster, I assume you mean the low speed idle screw. The correct proceedure is to screw it all the way in until it's lightly seated and then back out 1 1/4 turns. good luck.

 

[Bohogin]

Re: 1972 25hp rude spitting and sputtering

thanks icole i think i am getting water in the cylinder what is the best way to determine where it is coming from? have not checked compression yet going to check today.

 

[fireman57]

Re: 1972 25hp rude spitting and sputtering

Pull your plugs and look at them. If they are clean then you have water.

 

[Bohogin]

Re: 1972 25hp rude spitting and sputtering

thanks fireman i pulled the plugs and both look clean any idea where the water may be coming from?

 

[fireman57]

Re: 1972 25hp rude spitting and sputtering

First guess would be bad head gasket.

 

[Bohogin]

Re: 1972 25hp rude spitting and sputtering

but would the compression be as high as 115 and still be the head gasket?

 

[fireman57]

Re: 1972 25hp rude spitting and sputtering

sorry wrong post. Yes, I admit it I screwed up again.

 

[fireman57]

Re: 1972 25hp rude spitting and sputtering

When you say clean do you mean clean like new or clean as in burning a nice chocolate brown without junk on them?

 

[G DANE]

Re: 1972 25hp rude spitting and sputtering

After iddle, the plugs will usually be black on those.<br /><br />Try to adjust low speed iddle mixture screw, like this, quoting Joe Reeves, with boat in water, start by seating needle gently ( never with force) and backing out 1 1/2 turn, then after running WOT for a couple of minutes to warm motor up, let motor push boat unrestricted forward in gear:<br /><br />(Low Speed) Slow the engine down to where it just stays running. Again in segments of 1/8 turns, start to turn the top needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running. Eventually you'll hit the point where the engine wants to die out or it will spit back. Again, at that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting.