1969 40 hp evinrude dies at 1/4 throttle

[buckchaser1221]

i have a 1969 40 hp evinrude that dies at 1/4 throttle runs fine at idle and revs up in neutral but in gear no power and dies out any ideas??

 

[tx1961whaler]

Re: 1969 40 hp evinrude dies at 1/4 throttle

Start by checking things out systematically and eliminating problems.
Check the compression.
Check the spark with a spark tester.
If both compression and spark are fine, then pull the fuel line at the carb and make sure the fuel pump is pumping fuel.
If all of that is good, then rebuild the carb.

 

[buckchaser1221]

Re: 1969 40 hp evinrude dies at 1/4 throttle

ive gotten so many sugjestions to this problem wow i may as well go buy a new motor but this one ran great last year is it possible the coils and orpoints have any bearing on this issue thank you

 

[tx1961whaler]

Re: 1969 40 hp evinrude dies at 1/4 throttle

ive gotten so many sugjestions to this problem wow i may as well go buy a new motor but this one ran great last year is it possible the coils and orpoints have any bearing on this issue thank you

They can, but don't guess. The spark test will catch if they are bad. The compression test, spark test, and fuel pump test will take a half an hour, tops
A new 40 will cost in the neighborhood of $4500.
A carb rebuild takes an hour and costs 20 bucks.

 

[buckchaser1221]

Re: 1969 40 hp evinrude dies at 1/4 throttle

well did what you said went and got a carb rebuild kit rebuilt the carb took me 1.5 hrs everything spotless now it wont run at all unless i mess with the choke

 

[tx1961whaler]

Re: 1969 40 hp evinrude dies at 1/4 throttle

Assuming you have good compression, good spark to both cylinders, and the fuel pump is operating, then all that is left is the carb. Did you blow out all of the passages with compressed air? Was the high speed jet (bottom of carb bowl) cleaned out with a soft wire?
Very good instructions here: http://forums.iboats.com/showthread.php?t=244013
You're very close to having it running. I have had at least 5 of these motors over the years, and I have a 1969 on the boat right now.

 

[buckchaser1221]

Re: 1969 40 hp evinrude dies at 1/4 throttle

my carb bowl doesnt seem to have a hispeed jet that your talking about

 

[tx1961whaler]

Re: 1969 40 hp evinrude dies at 1/4 throttle

It's number 60:

 

[coolguy147]

Re: 1969 40 hp evinrude dies at 1/4 throttle

They can, but don't guess. The spark test will catch if they are bad. The compression test, spark test, and fuel pump test will take a half an hour, tops
A new 40 will cost in the neighborhood of $4500.
A carb rebuild takes an hour and costs 20 bucks.

an etec lol about 5-6 grand

 

[buckchaser1221]

Re: 1969 40 hp evinrude dies at 1/4 throttle

theres a plug there but no jet

 

[buckchaser1221]

Re: 1969 40 hp evinrude dies at 1/4 throttle

theonly numbers i can find on this motor are on a tag by the thermostat they are 40753e and eo4195

 

[buckchaser1221]

Re: 1969 40 hp evinrude dies at 1/4 throttle

it would appear the only thing there is number 62

 

[buckchaser1221]

Re: 1969 40 hp evinrude dies at 1/4 throttle

i can get it running now ifikeep the throttle higher but it has a bad cough constantly that dont change with the top jet adjustment

 

[tx1961whaler]

Re: 1969 40 hp evinrude dies at 1/4 throttle

OK. The cough is caused by it running too lean. The low speed needle valve should be able to adjust this out. The needle (#43) can be backed all of the way out after removing the packing nut (#50), and you can spray carb cleaner (or WD-40, in a pinch) through to try to clear the passages. You can also use compressed air, but ypu may have to remove the packing before trying that.

 

[buckchaser1221]

Re: 1969 40 hp evinrude dies at 1/4 throttle

i thank you greatly for your advice and will let you know the outcome of my situation as i am done tinkering for the day thank you again its very appreciated

 

[coolguy147]

Re: 1969 40 hp evinrude dies at 1/4 throttle

well is it like a sneeze?

or is that it dies then slowly comes back to rpm?

umm check spark. need to see if its at least sparking or if it has a missing one on and off. also probably should get a ncie rebuilt kit with a new float. this will alow u to make sure u dont have a leak in fuel or air anywhere.


have u replaced the impeller recently?

theres a nice threads at the top of the johnson evinrude forum. abotu carb adjusting.

so just start out put ur high speed needle at 1 out and low speed 1 1/2 out. to start off

 

[buckchaser1221]

Re: 1969 40 hp evinrude dies at 1/4 throttle

fried lower unit last fall so i replaced it the only jet on the carb is the one at the top of the carb its like a sneeze