1976 Evinrude 25 starting problems

falconduvent · #1 August 13th, 2007, 08:23 PM

i have a 1976 Evinrude 25 that is under the weather.

First it ran, then after a few days, it carboned up on me.

Cleaned plugs, to no avail.
Discovered that oil gas ratio was supposed to be 50:1 instead of 32:1, so fixed that.
Cleaned the carb and it ran fine again, took it out, after 10 minutes wide open, began to hesitate and slow, by the time i got back to the dock, it was shaking and coughing. the #1 plug was badly carboned and the #2 plug was fine. Cleaned the plugs and tried again, didnt start, tested spark, found the #2 plag was shot. Looked up spark plug advice, found out i had the wrong plugs, rplaced them with the right ones, J4C @.030 from champion. Tried it again, engine coughs, take off choke, it wont start, floods. Any suggestions?

wbeaton · #2 August 13th, 2007, 09:30 PM

Are you getting spark in both cylinders? Have you cleaned and set the points (.020")?

Solittle · #3 August 13th, 2007, 09:40 PM

Did you rebuild the carb?

falconduvent · #4 August 14th, 2007, 09:19 AM

I have a fat blue spark on both cylinders, points set at .030, as recommended by Evinrude. The carb is in excellent condition, and was overhauled and cleanded 2 days ago. The low speed jets, (there are 3) were slightly obstructed and the main jet was blocked. Now it doesnt start because it floods right off the bat. The motor ran fine up untill a few days ago.

wbeaton · #5 August 14th, 2007, 10:12 AM

Plug gap is .030. The point gap is .020.

If its flooding you still have a carb problem. Did you rebuild the carb or just clean it? Sounds like either the float needle isn't seating or the float is sinking or is not set correctly. Buy a rebuild kit if you didn't the first time and clean everything again.

BoatBuoy · #6 August 14th, 2007, 10:22 AM

Since one plug fouled and the other one didn't, it sounds like maybe your fuel pump is leaking fuel into the cylinder where it's mounted. Pull the pump off and squeeze the primer bulb on the fuel line and see if fuel comes out the back of the pump.

falconduvent · #7 August 14th, 2007, 01:47 PM

fixed it. The final issue was that when i put the carb back onto the engine, i neglected to turn the needle valve for the low speed jets in the proper amount. I compared it to a working motor like mine and adjusted it accordingly. when i tried starting it again, it took a little adjusting while rnning to find the sweet spot between too rich and too lean. i disconnected the control nob for the valve so it will not be in danger of accidental maladjustment. Thanks for your insight.