Now running 50:1 in my 15hp evinrude

[imported_Warren]

Hello, I have now switched to running 50:1 in my 86 15hp evinrude outboard per everyones advice. My motor is now hard to start. Usually takes 2 really hard pulls. Think I need to get my carb adjusted to run right but don't have the funds to take it in, any suggestions? or should it run fine? Also do I need to change the gap in my plugs to get it to run right? I also noticed that my outboard seems to be using more fuel than it used to, is this normal when running 50:1? Is there any in between like 75:1 that may work better?.....Sorry for the swamp of questions but the place where I fish is called the wall here in cali and on my 12 foot aluminum boat at night. If the motor won't start it could mean me hitting the rocks.....Thanks for any help.....Warren

 

[Boatist]

Re: Now running 50:1 in my 15hp evinrude

Warren<br />First do not understand why you started a new thread with the exact same subject. You really should continue with the old thread. On a 15 HP motor the only carb adjustment is from the front of the engine. The Lean/Rich knob, start the motor and let it warm up then turn the knob in the lean direction a little at a time then wait 15 sec to see what difference it makes. When you go too far the motor will start to cough, then turn it back to rich a little at a time untill motor runs steady at it highest speed. Pull the adjustment lever off with out turning and center indicator tab and push back on. It is now adjusted and centered. There is no high speed adjustment. The Plugs should be clean and adjusted to .030. Your motor should run 50 to 1 unless you only troll then can go a little higher. The difference form 100 to 1 to 50 to 1 as far as fuel mileage I dout you could messure. For starting when cold pull the choke pump the ball till firm and pull. Two pulls very normal when cold. On my 15hp motor it usually starts on the first pull but flood before can push the choke in. Then I start with the choke in. If your fishing somewhere where need motor running to avoid hitting the rocks I would start it early and not take a chance, it does have a nutueral and will idle all day on less than 3 gallons of fuel. You got some very good info on your last post along with the best 15hp link on the web.<br />Good Luck

 

[imported_Warren]

Re: Now running 50:1 in my 15hp evinrude

Thanks for the help. For some reason I was unable to find my first post. I went through about 20 pages and couldn't find it....Well I just returned from fishing and the motor broke down so i'm back to the drawing board. I think its the head gasket. It stalled on me today and wouldn't run good till the motor cooled down. Guess i'm gonna go and look for the book this weekend....Thanks Warren

 

[Bear]

Re: Now running 50:1 in my 15hp evinrude

Click "View Recent Posts" in your profile: <br /> View Recent Posts

 

[Boatist]

Re: Now running 50:1 in my 15hp evinrude

Warren<br />Your old post was back about 4 pages yesterday. I would not supect the head gasket but a compression test will tell you. Is motor over heating? You should be able to hold your finger on head for about 4 seconds. If it getting too hot can be bad impeller or bad thermostat. Did you adjust the carb? Do you have spark to both plugs?<br /><br />You can get a manual here on this site. Great idea to get a manual as will save your time and money in the long run.

 

[imported_Warren]

Re: Now running 50:1 in my 15hp evinrude

Yes, the motor did appear to be overheating, the water at the lake was warm 73, and I noticed that the cooling water was peeing really good but it was warmer than the lake water. I went and talked to the mechanic at the lake and he said it could be many things. I just replaced the entire water pump housing and impeller a year and a half ago. As for the carb don't know how need the book. looked into the intake and there is nothing blocking incoming water. Do you think it could be the change over from 50:1 that is gumming up my motor? It ran fine, then all of a sudden would start to spudder then stall. don't think it was flooding because I had to pull the choke and give it full till to get it started again after a couple of minutes. It would run fine for about 30sec then do it again....I have no idea..Do you???..Thanks for the help.....Warren P.S. I would like to purchase the book from this site do you know wich is best for my 86 15hp evinrude?

 

[mercury1]

Re: Now running 50:1 in my 15hp evinrude

Im thinking that you have something else wrong with your motor. I cant imagine switching fule/oil ratios would just abruptly cause your motor to start acting up. You could probably run that thing at 25 - 1 and it would still go just fine, just smoke more.<br /><br />As far as overheating, check your thermostat. That motor is getting to the age that the thermostat may be going bad. If you by chance saw white "smoke" steam coming out of the back, or the water indicator, it is/was overheating.<br />I would with the thermostat, hopefully if it got too hot, it didnt score cylinders.

 

[wayne h]

Re: Now running 50:1 in my 15hp evinrude

you think 2 pulls is hard starting ??? i am in big trouble them mine takes like 5-6 when its cold

 

[Boatist]

Re: Now running 50:1 in my 15hp evinrude

Warren<br />You need to start with some checks and test. First thing I would do is get 2 new spark plugs and replace and see if makes a difference. The Gap should be .030. If it makes a difference then your all set. If it makes no difference then put old back and new set in your tool box. <br /> <br />Check the temperature of motor, way that works very well is to pull the cover and put your finger on the head. Motor should run about 140 degrees so you should be able to put finger on head for about 4 seconds without getting burned.<br /><br />Check your spark, pull one spark plug wire off and see if it runs then put it back and do the other one. With motor running and some good insulated pliers pull one spark plug wire at a time and see if it makes a difference. Take a old plug and gap wide .060 or more and put a plug wire on it ground plug and start moror and check for good soark. Then do other plug wire.<br /><br />If you left gas oil mix in the carb over winter then carb jets could be plugged up and you will need to pull carb take apart and clean out the jets. Check the float, needle and seat. adjusted carb as given before.<br /><br />Only real difference between 50 to 1 and 100 to 1 is how much it smokes at low speed and how much it wears. Also plugs will foul more offten at 50 to 1.<br /><br />Best manual is OMC factory manual it can not find a new one try EBAY.