1976 Evinrude 4hp Overheated

[highavenue]

1976 model#4636M serial#E0001767<br /><br />I just inherited this motor and know nothing about it. It didn't say specifically so I used a 50:1 mixture- it was the newer type oil. It was at full throttle for about 30 minutes when it started to get hot and slow down. The motor was pushing a 9ft Livingston with two adults. I wasn't anywhere near shore so I ran it a bit more to get closer until it stalled. The engine still turns. I rowed it to a friends house that was close by and there it sits.<br /><br />Was I running it too lean? Pushing it too hard? Should I bump the ratio to 25:1 or more, restart it and drive it home? Could it be a water pump, how would I know? Any advice and/or suggestions would be greatly appreciated. Thanks.<br /><br />Craig

 

[Bob_VT]

Re: 1976 Evinrude 4hp Overheated

Define older? Pre-64? (laughing sorry but my son considers my motor 1979 older!) The older (true older motors ran 24:1 ratio 1 quart oil to 6 gal gas) motors were slighly differant. If you infact leaned it out by a low oil mixture you could have done some real cylinder wall damage. You should also check the water pump impeller which could have just given out from age. Check your current compression and see where that is too.<br /><br />Bob

 

[highavenue]

Re: 1976 Evinrude 4hp Overheated

Thanks Bob, I just found out it was a 1976. Does that help? Thanks.<br /><br />Craig

 

[DJ]

Re: 1976 Evinrude 4hp Overheated

highavenue,<br /><br />50:1 is correct for that engine. I think your problem is the water pump (impeller) not the fuel.