1956 evinrude

[muttimike]

I have a 1956 15hp evenrude, serial# 15016-16392.Motor has elec. start and starts right up, but it idles rough , coughs a little and stalls. it runs great wide open at high speed but not slowly. what can i do?I cleaned and rebuilt the carb.it also has new plugs, fuel tank and lines Do i have a fuel filter , if so where is it. .I have been using a 25 to 1 fuel mixture .need help!

 

[Chinewalker]

Re: 1956 evinrude

Hi Mike,<br /> Generally, idle issues come from one of two main sources. Either the carb is misadjusted or dirty, or the motor is sucking air somewhere at the crankcase. Either can cause a low speed sneeze due to lean mixture.. If the upper main seal is bad, then you'll be getting a fair amount of oily mess on the armature plate. If the crankcase halves are blowing out, you'll get the oily mess all over the crankcase and block, weeping from that seam. The bottom seal is harder to diagnose. <br /> How is compression on the motor? <br /> When you cleaned the carb, did you blow everything out with compressed air?<br /> The fuel filter should be in the glass sediment strainer on the bottom of the carburetor, unless you've got an electric choke, in which case you might have a glass sediment bowl somewhere else on the motor, likely on the exhaust cover.<br /> 25:1 mix is good. Don't use the original oil (SAE30), but rather make sure you're using modern TC-W3 rated oil...<br />- Scott

 

[Paul Moir]

Re: 1956 evinrude

Welcome to Iboats, Muttimike!<br /><br />This post is going to get moved over to Johnson/Evinrude questions. But in the mean time here's a few ideas:<br /><br />You say your engine has a new fuel tank and lines, but the 1956 engine should be using a dual line (pressurized) tank that hasn't been available for some time now. Perhaps someone converted your engine over to a single line tank with a fuel pump? If that's the case, the fuel filter may have been removed to make room for it. The fuel filter on earlier outboards like yours was in a cast aluminum affair with a glass cup so you could visually check the fuel and filter. On later engines, the fuel 'filter' (more of a screen) was integrated into the fuel pump. Access is given by 1 screw.<br /><br />You say you rebuilt the carb - did you set the idle mix correctly, or does the engine even respond to the idle mix screw? Did you remove the soft plug on the top of the carb and manually clean out the idle orifaces? I just need to be sure.<br /><br />Assuming your's has been converted to single line, does pumping the primer bulb help it idle? Does it hurt it?<br /><br />How's the midrange?<br /><br />Sorry for all the questions, but I'm sure we can get that sucker idling right for you.<br /><br /><br />EDIT: Chinewalker posted while I was typing this. You would be wise to listen to him!<br /><br />JB - Good evening!

 

[JB]

Re: 1956 evinrude

Howdy, Paul. <br /><br />As Paul said, Muttimike, this belongs in the JohnnyRude troubles Forum.<br /><br />I will move it there for you.<br /><br />Good luck.