1963 evinrude not running properly

[yorab]

Where do I start?! My 1963 evinrude 75 hp 4 cylinder model #75383 just doesn't want to run worth a &*%#$. It will start. Sometimes it idles good, sometimes not. The motor never runs good after about 10 minutes. I have recently rebuilt the carb, hoping that would solve my problem, but it didn't. Now for a bit about the motor. Over the years the mechanical fuel pump has been replaced by an electric pump. I can't find any specs. on fuel pressure requirements for that motor. I have disconnected the pump outlet hose and observed a good pulsing of fuel from the pump. I am nearly certain that I serviced the carb correctly because the problems that I am having now are the same as before the carb. rebuild. Also, the resistor wire is gone, but an automotive type coil and resistor is now used. I have replaced the points, condensor, dist. cap, rotor, plug wires and coil wire. The automotive type coil and resistor are both new. I don't know what else to do. I just want to cruise out on the lake.

 

[JB]

Re: 1963 evinrude not running properly

Howdy, Yorab.<br /><br />Unfortunately, not running worth a !@#$%^& doesn't give me much info about your engine's misbehavior.<br /><br />I've been through my Johnson V4 75hp stuff on the distributor ignition and didn't get any inspiration.<br /><br />You need to do some isolation procedures to determine if your problems are fuel, ignition or synchronization/timing related. <br /><br />If you still have no luck, come back and describe, in polite terms exactly what the engine is doing or not doing in the way of misbehaving.<br /><br />Good luck.

 

[yorab]

Re: 1963 evinrude not running properly

I decided to disassemble the carb again to be certain that it was ok. Upon inspection, I noticed something with the non-adjustable high speed orifices. If I hit one orifice with compressed air, I could see what looks like a small needle extend out into the carb throat. However, if I do the same to the other orifice, there is no needle extending out. Besides that, I can see nothing else wrong with the carb. It is very clean. I have good spark at each plug. I synchronized according to my Seloc manual. Before I put the carb back together I will need some information about the high speed orifice. Thanks.

 

[JB]

Re: 1963 evinrude not running properly

I will try again.<br /><br />Please tell us what the engine is doing or not doing that causes you to say it isn't running correctly.<br /><br />Do you have the battery type breaker point ignition or the CD type ignition?<br /><br />What manual are you using?<br /><br />Let us know.

 

[yorab]

Re: 1963 evinrude not running properly

The engine idles, but when I open the throttle, the motor dies. It has battery distributer ignition.

 

[yorab]

Re: 1963 evinrude not running properly

Sorry for the vagueness of the description. I have a Seloc manual covering 1958-1972 3 cylinder and v4. Since my first posting I have discovered an unusual condition with my high speed orifices. I would like to correct that condition(if the condition needs correcting). The condition was described in an earlier reply. My manual has very little information about non-adjustable orofices.

 

[Hooty]

Re: 1963 evinrude not running properly

I don't think a "needle" should be extending from the orfice of a fixed orfice carburetor into the throat. Does your manual show one? If not, remove it and try to figure out where it came from. Could a stopped-up jet cause your problem?<br /><br />c/6<br /><br />Hooty

 

[yorab]

Re: 1963 evinrude not running properly

I shot compressed air into both high speed orifices and now I have what looks like a needle extending out into the throat from both orifices. My manual does not mention these "needles", nor can I see them in any of the photos. I don't know if they should be there or not. This is the first time that I have serviced a carb so I am not extremely knowledgable on this subject.

 

[sawcat]

Re: 1963 evinrude not running properly

fixed jets are fixed thats trash your looking at.i dont remember seeing anything like that when i rebuilt carb 1963 johnson v4 75 horse but i guess i could be wrong get a light & magnifying glass maybe goodluck,sawcat

 

[JB]

Re: 1963 evinrude not running properly

Howdy, Yorab.<br /><br />Your engine falls into a gray area between my two manuals. Do you have a single, four barrel carb or two two barrel carbs?<br /><br />In either case you will have four, not two, high speed orifices. If you have the twin two barrel carbs you have adjustable high speed venturis that call for a special alignment tool.<br /><br />Unfortunately neither of my manuals gives a detailed enough breakdown to see what you are getting that looks like a needle in an orifice that you believe is a high speed orifice.<br /><br />From your description of your symptoms, I agree that you have a fuel starvation problem from the high speed circuits. With four circuits it is probably a problem with all of them, as I believe your engine would run at reduced power if only one or two were not working.<br /><br />Let us know what carb(s) you have.<br /><br />Good luck.

 

[yorab]

Re: 1963 evinrude not running properly

I want to first apologize for the vagueness of my descriptions(again) and my poor use of proper terminology(rookie). I know just enough to get me into trouble! I have a single carb with two barrels. The top of the carb will unbolt from the bottom half of the carb. The top half contains the 'roof' or 'lid' of the fuel bowl. It also has the fuel inlet nipple for the fuel bowl. Inside the barrels of the top half of the carb are two tiny holes(one hole in each barrel). From these holes will protrude a tiny needle-like piece if I put compressed air into the passage that leads to it. On the opposite side of these needle like protrusions is a passageway to the outside of the carb body that lokks as if has been sealed at the factory. Has any body ever encountered this before?

 

[JB]

Re: 1963 evinrude not running properly

Okay, Yorab.<br /><br />I have the overhaul instructions for the two barrel carb, but it doesn't have orifices in the "top" of the carb. They are both (high and low speed circuits) in the part that has the float bowl.<br /><br />The low speed adjusting needles are angled into the casting, pointing toward the carb throat. There are small handles on the needles.<br /><br />The high speed (main metering) jets are inside the casting at the bottom of the casting, perpendicular to the throat. They are behind the drain plugs and are screwed into the casting.<br /><br />Is this the carb you have?

 

[yorab]

Re: 1963 evinrude not running properly

Yes, tht is the carb that I have. In the bottom portion of the carb and inside the barrel are very tiny holes. I believe that there are six tiny holes in each barrel. In the top portion of the carb are two very tiny holes in the barrel walls, one in each barrel. When the two halves of the carb are seperated, I have access to a few different passageways that go from bottom portion to top portion. If I spray carb cleaner or used compressed air in one of the passageways that leads to the tiny holes in the barrel of the top portion, very small needle like protrusions come out of the holes. Are these holes where fuel enters the barrel? If so, are those needles that protrude from the holes used to atomize the fuel better? One of those needles was stuck in the hole until I got some carb cleaner in there and hit it with compressed air. The tiny holes in the bottom portion of the carb do not have those needle like protrusions. They seem to be clear, open holes. If I remove the low speed needle valves(the ones you spoke of that angle down into the carb), and spray carb cleaner down in, the cleaner will seep form those holes.