1970 evinrude

[dukeryan1]

I have a 1970 model evinrude motor. It is a 75 hp and I have a problem. In neutral it runs fine. rpms go up like they are supposed to. but when I put it in drive and gas it the rpms dont get above 1 and a half.It just dont have any power.

 

[bigpoppakdog]

Re: 1970 evinrude

in the water or in the driveway with the garden hose? The typical response to this is carb work. Need to clean the carbs or fuel line leak/clog fuel filter. Next would be the link and sinc/timing check. Then check idle/mixture. If that all checks out move to spark plugs..maybe they are shot...then move to powerpack/ignition coil. Suppose under the flywheel would be next. But my guess is poor fuel delivery. Did I miss anything experts?(there are many on here....i'm not one of them.) But with my 1970 it's important that the carbs are clean and the idle/mixture is set correctly. Otherwise she idles great, but when you try to give a little gas it bogs and shuts down.

 

[tashasdaddy]

Re: 1970 evinrude

ethanol poisioning. >>> http://forums.iboats.com/showthread.php?t=299680

 

[bigpoppakdog]

Re: 1970 evinrude

don't want to argue with the experts, but my manual indicates the slow speed screws to be 7/8 open. 1 1/2 is way to rich and causes the motor do flood out during throttle. I tried with the 1 1/2 setting and it was a no go. Followed the manual at 7/8 and it ran like a champ.

Is my manual incorrect? I know with these its an adjust as you go until it works process, but 7/8 to 1 1/2 is quite a bit of difference.

 

[Lion hunter]

Re: 1970 evinrude

Big poppa,
1.5 is more or less a starting point. From there you turn in 1/4 at a time (then wait a few seconds) until it starts to stumble. Then back off about 1/4 turn. Every set up is going to be different based on elevation, and there are probably variations in every carb. Where I live mine usually end up around 7/8 to 1 as well.
The idea is if you start out rich you know you have to turn it in. If you started right at 7/8 you would might be turning in and out for awhile to get it right.