Home › Forum › Ask A Member › 1974 Evinrude Yachtwin 4hp – failing to start
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legendre.
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August 4, 2015 at 2:43 am #21514
Update –
I pulled the flywheel off and checked the points. I tried to use the tool I got from Frank, but its too large, it sort of worked though anyhow as I just put the keyway on the key and set the pointer in the right spot and went from there. The top on the lobe on the crank was at the points so I went ahead and adjusted them there, and actually they seemed well adjusted so I may have done this as well last year.
I did succeed in getting the carb out. I pulled the high speed needle assembly and that made it relatively easy. Cleared a lot of gooey fuel out of there with a spray can of carb cleaner. I then re attached the carb and replaced a fuel line from the pump to the carb that looked suspect.
I did forget the compression tester at home so I did NOT do that.
I took the motor back out to the boat and tried to get it running and still no luck. It will fire off with a spray of starting fluid, but no luck with the tank gas.
The tank has new fuel in it. It is probably a little more oily than this motor needs (closer to 20:1) but I would think that might cause it to smoke lots but still run?
Jay
August 4, 2015 at 3:54 am #21518quote Jay:Update –Cleared a lot of gooey fuel out of there with a spray can of carb cleaner.
JayIf it was that bad, you might want to take the bowl off the carb to clean it thoroughly. The jets and orifices can plug up quite easily from crud in the bowl and a good soaking and blowing out with compressed air will clean them out.
August 4, 2015 at 1:08 pm #21524Thanks Mumbles – I did pull the bowl off and spray around, but maybe a good soak and blow out will do the trick. I’ll take it apart tonight and drop it in the carb cleaner can and let it soak. I’ll check compression before I do.
Would the fact that it fired and ran shortly (1-3seconds) with the starter fluid indicate that the ignition side is ok? Can the starter fluid mask a compression issue?
Jay
August 4, 2015 at 3:24 pm #21526Running on the fluid probably means the ignition is OK, and the carb is not delivering fuel. Once you are done cleaning the carb, connect the fuel line before installing it on the engine with the high speed needle removed. Now connect the fuel line and pump the primer bulb, you should see fuel running out of the carb bowl. Doing this with the carb off will save time if there is a problem with the inlet needle/seat.
March 21, 2016 at 1:31 am #33733So – I let this motor sit last year after not getting it to run. I went back after it the past few weeks. No fuel was getting through the fuel pump, so I put a rebuild kit on that and stuck it back on and fuel was getting through, but still it would not start. I followed fleetwin’s advice and discovered my inlet needle was sticking.
I found another needle in the garage and replaced it and success. The motor started. I only had it in a tiny bucket of water so I shut it off. If I get a chance I will take it up to the lake this week for a run to see if it’s running good and pumping water.
Thanks for all the help.
March 21, 2016 at 3:08 am #33738quote legendre:First off, check compression – that’s just standard drill.If you don’t have a tester, then pull the plugs, put your thumb firmly over one plug hole, and have someone pull the recoil once or twice. If the motor promptly blows your finger off the plug hole, then move to the other cylinder. If both blow your thumb off the hole, then you probably have enough compression to run it.
Not enough compression to blow your finger off? Then look for compression leaking issues in the power head.
Ahhh……so the proper way to check compression is with your thumb? And if your thumb tells you it is low you are advising disassembly and look for the loss of compression…………..(insert sound of crickets here)………!March 21, 2016 at 3:15 am #33739Wonder what happened to that legendary fellow as he hasn’t checked in since Last August 🙄 ❓ .
March 21, 2016 at 3:37 am #33740quote Wedgie:Wonder what happened to that legendary fellow as he hasn’t checked in since Last August 🙄 ❓ .Saw that, Wedgie, but you have to remember that this section is meant to be a learning section, open to folks starting out and needing help. When I see an answer like that I Would hate to think someone took that information as THE way to troubleshoot their engine. Not the first time for that poster and I have no problem addressing it each time he posts garbage like that.
March 21, 2016 at 9:49 am #33742My old boss used to say that "you can talk to somebody like a Dutch uncle and they are still going to do whatever it is they want." While I never fully understood that expression, I got the idea behind it. Jay is not alone. Helping people can be frustrating.
Long live American manufacturing!
March 21, 2016 at 12:13 pm #33744Jay
So where are you at with this engine? I kinda wish you didn’t "rebuild" that fuel pump, that is a very trick operation that usually renders the fuel pump inoperative. Worse yet, the fuel pump could leak into the number one crankcase flooding that cylinder. But, on the other hand, most guys can see, and aren’t as uncoordinated as myself, so hopefully you got the pump back together OK.
Your post mentioned that fuel would not flow through the fuel pump, is this correct? This seems like an unusual situation, unless the filter screen was plugged up. Does fuel flow through the pump now?
And yes, I am thinking the ignition is "OK" if the engine will run briefly when primed with starting fluid. But, does it sound like it is running OK, on both cylinders during its brief run?
Let us know….D -
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