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1981 Evinrude 25hp won't start

Niteblaster

New member
Well it ran last summer but not running this year. It has spark on both cylinders atleast with spark plugs out and grounded to motor. It will usually fire and run about 3 seconds when I try to start it after it has sat over night but only for 1 or 2 times then usually won't fire at all. I have tried squirting mix gas in cylinders under spark plugs and it won't run that way. Some times the spark plugs will be real wet when I check them and some times they are dry. Yesterday I pulled the carb off and sprayed some carb cleaner in and blew it out with an air hose. Before I put the carb back on I squirted some pre mix gas in where the carb bolts on pulled it and it fired right up and ran until gas burned off. I put carb back on and pulled it would run about 3-4 seconds then die and can't rev it with throttle either. I tried priming the bulb on the fuel line with fuel line unhooked from bottom of carb and gas comes out. Today I tried squirting some pre mix through the carb and it wouldn't fire and I tried under spark plugs again and it wouldn't fire that way either. Seems like it is a fuel issue since it did start with carb off right? What is the minimum compression needed on each cylinder to run? While cleaning the carb I am not able to remove the tube in the center that goes to the bottom of the bowl. Seems like it should come out but doesn't want to unscrew. I did blow air through every hole I can find and made sure it came out some place so I assume it isn't clogged. I did forget to remove the slow speed needle or jet not sure which it is when I cleaned it yesterday so today I unscrewd it sprayed carb cleaner in and blew it out with air hose and still won't start. Any suggestions or help would be very appreciated it drives me crazy to have something not working and I hate to have it just sit in the yard not being used.
 
it may be your low speed needle needs adjusted...have you tried new plugs? just cuz you see spark the way you checked does not mean you have good spark. id try new plugs and fresh gas and go from there....
 
well I went out today to replace sparkplugs but decided to try it first 1 more time before changing them and it started 1st pull and is running fine. The whole time I didn't have the throttle open enough was the issue. My other boat won't turn over if the throttle is too far forward so am used to having it barely open.
 
well I went out today to replace sparkplugs but decided to try it first 1 more time before changing them and it started 1st pull and is running fine. The whole time I didn't have the throttle open enough was the issue. My other boat won't turn over if the throttle is too far forward so am used to having it barely open.
it should start with the throttle in start position, shouldn't have to advance the throttle. but if it works good deal!! might wanna put new plugs in it for peace of mind though...
 
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