48 SPL Evinrude runs on 1 cylinder unless Primer is held

[greasemonkeyjmj]

I have a 1987 Evinrude 48SPL, newly rebuilt with 3 gallons of fuel run thru it on the hose. Compression is 145 PSI on both cylinders, new plugs with blue spark jumping 7/16 gap. I notice on the hose that thew bottom cylinder would drop out every so often, but i could throttle it up and the cylinder would come back in, I thought maybe the extra rich break in fuel may have been fouling the plug, so I put in a new plug and took it to the water for the first time. the only way I could get any rpm's out of it was to hold in the key switch for the primer to stay engaged, if I let out it would drop back down to one cylinder. What do you think, Carb troubles or maybe fuel pump not putting out enough fuel?

thanks

 

[racerone]

Holding the primer in on the control indicates a carburetor problem.---The primer valve opens and squirts fuel into the engine.---This fuel bypasses the carburetors !----So do both carburetors to make sure they are clean with no restrictions !!

 

[greasemonkeyjmj]

Thanks as usual Racerone. I gave the carbs a little soaking and cleaning. And I also had some water in my fuel so between taking care of both of those things it did good on the trip out a bit ago.