My 35 HP Evinrude wont go over 10 mph?

[mr_jman]

I have a 1977 Evinrude 35 H.P. tiller motor that has been maxing out at about 10 mph. It is pushing a 1988 Lund Pike 16'

I know the motor has a top speed with this boat of about 30 mph but for a while now it refuses to go over 10 mph. I just had it in and got the carbs cleaned and had the fuel lines and filters checked as well.

Not sure what the problem is but no matter how much weight is in the boat (one, two, or three people) it still maxes out at 10 mph.

Any thoughts on what may be wrong with it?

[BoxMN]

Spun hub. Take the prop in and have it checked. I bet it is shot. Quick and cheap fix if that is it.

[bobbymalone]

You can pull 30mph out of that thing? Measured by GPS?

[boatfixer]

Spark, fuel and compression.

Sounds like it may only be running on one cylinder.

Have you verified spark and compression yet ?

[mr_jman]

Well it turns out my motor works just fine. I had so much weight in the back of the boat that I couldn't get the boat to plane out.

I might look at those "fins" that go on the cavitation plate. I'll have to make a new post and ask a few questions I think.

... Yes, the motor would top out at about 28mph.