1975 Evinrude 9.9hp not starting

[PatBlake]

I just picked this motor up. Started it several times in the driveway on the first pull every time. Got it on the water, and of course now it's not working. It only ran for about 4 seconds after starting on the first pull, then nothing. The next day I did a 90-minute round trip to get some carb cleaner. After spraying it I got it running, but only for 4-5 seconds and only after I sprayed the carb with cleaner. - I was originally using the gas that came in the tank the guy gave me. Not sure how old it was. Changed to fresh gas after my issues. Mixed 50:1. - fuel pump is fine. Disconnected the hose at the carb and tried starting, the fuel pumps out the hose with no problem. - I have spark. Pulled plugs, reinserted into boot and put on crank case while pulling starter rope. I saw sparks! - plugs are dry, which leads me to believe it's the carb that's plugged up. It has new plugs and wires So: how difficult is it to pull the carb off this motor? I've never done this and don't want to screw it up. Anyone have a link to a video for this specific motor? I can't find anything. Thanks! Pat

 

[Lewis1111]

Hi Pat pulling the carb from the engine is not a huge task. Once you have it off I would inspect the reed valves as well. Once you have the carb apart I usually spray brake clean or a carb cleaner through all the ports and make sure that it comes through the other side, that way you ensure there is nothing blocking the passages. Probably not a bad idea to have a new carb kit for it too.

 

[PatBlake]

Thanks, Lewis. If I don't have a carb kit here at the cottage, can pull it off and clean it and have it work for the next couple of days until I'm home on Sunday?

 

[AlTn]

google,,,leeroy's ramblings omc 9,9/15 hp. maintenance and repair...there's some youtube stuff as well...fooling with the starter is tricky, electrical tape to keep it together helps

 

[OptsyEagle]

When you are starting it, do you have the throttle on full to the neutral stop? Ignore the writing on the twist grip. You also want to verify that the choke is operating properly.

On that motor, when you get it to start you sometimes have to play with the choke on the cold mornings, to keep it running. Once it warms up it will be fine. You could also try turning out (counter-clockwise) the slow speed adjustment knob 1/2 to a full turn to see if it helps. If it doesn't turn it back to where it was. If it does, come back and we will give you the instructions to set it correctly.

 

[PatBlake]

Cold is not something we're dealing with right now. When I launched the boat it was close to 30 celcius and VERY humid. It's been like that every time I've gone to start it. It's doesn't matter where I put the twist grip the result is the same. I went to starting it on the first pull every time to it never starting. Slow speed was set by seating it lightly and backing off 1.5 turns.

 

[captk]

have you verified that you have spark to both plugs. those 73 thru 75 .9.9 15hp have low tension ign. strange beast and if you dont have the manual get one.

 

[OptsyEagle]

My last thought is the timing advance set up. When you turn the throttle grip you will notice that a metal piece (throttle cam) from under the flywheel moves and pushes on the roller of the carburetor to give the motor more or less gas. If this isn't set properly it can effect when your spark fires and how much gas your motor is getting at start up. It is probably fine but if it is off you can pull that rope until the cows come home and get nothing.

When it is set right the arrow on that metal piece will be in the center of the carb's roller JUST as it touches the roller. If it is to one side or the other of the roller, there are two 5/16" nuts on the starboard side of the motor just under the flywheel to adjust it. Just loosen them, move the throttle cam to the correct position and re-tighten. Unfortunately due to a bad design, you will need a fairly thin 5/16" wrench to get under the flywheel. Anyway, an easy thing to check.

 

[PatBlake]

@captk I have verified spark from both plugs @optsy the roller appears to be lining up in the right spot.

 

[F_R]

If you haven't already heard, those motors (1974-76) were death on spark plugs. You said they are new and dry, so I'll accept them for now. But any time you experience bad running on that model, the first thing to suspect are spark plugs...............I don't care if they are new.

P.S. I've seen lots of them that wouldn't run one weekend without fouling plugs. A true "lemon" motor if there ever was one.

 

[PatBlake]

But if they're dry, doesn't that mean they're not getting fuel, regardless of spark or no spark?

 

[PatBlake]

But if they're dry, doesn't that mean they're not getting fuel, regardless of spark or no spark?

 

[PatBlake]

Just checked the plugs. On the motor it says use Champion J4J, I have NGK B8S. Could that be the issue? Keep in mind I did have it running no problem in the driveway.

 

[AlTn]

sounds like your needle may have gotten stuck in the seat somewhere between the driveway and the lake....with fuel choke, is there any evidence of fuel either leaking from the carb throat or gathering in it?...

 

[82rude]

well I guess my 15 evinrude of 76 vintage didn't get the memo that it was a lemon F R.runs flawlessly all the time every time unless your foolish enough to try ngk plugs then it refuses to run .who said motors are just machines and don't have character?

 

[PatBlake]

Thanks for all replies, at this point it's all moot. I was a bonehead and somehow stripped the threads for one of the spark plugs, so it's off for service anyway. I'll get the shop to look at the carb. I'll let you know what they say.