Mariner motor high speed issues

[scruffy_fish]

This question is still pluaging me. I have a 50hp 4 cylinder '84 out board that will run all day at ideal, but when I take it over 3200 rpm it will begin to bog and eventually need to be dropped back to lower rpm or stall out. I let it ideal for a while then it responds beautifully until it goes over 3200 rpm again and repeats this all the time.

I have gone through all the vacuum possibilities, re bulit the carbs and new fuel lines. It seems like a gas starvation issue. Any one even experience similar?

[newbeematt]

i would put a clear inline fuel filter right at the engine so u can see if it runs out of fuel

Matt

[Bamaskeetshooter]

I would hook up a portable fuel tank with a 3/8" hose to make sure it's not a fuel issue.

[wmalloy382]

Bamaskeetshooter - 8/22/2008 8:00 AM

I would hook up a portable fuel tank with a 3/8" hose to make sure it's not a fuel issue.

That's where you start. Separate tank and fuel line

[BigShrimpin]

Sounds like a problem with your stator. Check using a multi meter.

[Intrepid 246]

Check your compression. Had the same problem with a 90 it was way low on the top one.