1983 25hp Evinrude running rough

[rpena]

THanks for your help I really appreciate it. Just saw some guy on YouTube with the same problem, so I passed on the info. I will post the lake test & thanks again!

 

[rpena]

https://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=ZGmRCIQb_no

 

[rpena]

Well my engine has developed a new problem or maybe I did'nt noticed before I have only had it out on the lake 4 times. but while running across the lake at full speed after about 5 minutes or so, it starts to surge almost like it's running out of fuel. Does'nt do it all the time either......? If I throttle down for a second or 2 then throttle back up seems to fix. Does anyone know what could be causing this? Thank you :?

 

[richg99]

I am no mechanic, but I would check for a momentary air leak in the fuel line....i.e. bad O ring(s) on the connectors, etc.

Check the fuel filter(s) for gunk that might temporarily slow your fuel flow at high speed.
Check the vent screw to be certain it is all of the way open.

Not saying that any of these things are the cause of your problem, just some things to check out.
Rich