Evinrude 115 changing gears

You know the drill..

Moderators: Redneck_Randy, badmoonrising, lakerunner

Post Reply
Message
Author
Kimo1972
Posts: 2
Joined: Wed Aug 05, 2020 11:27 am

Evinrude 115 changing gears

#1 Post by Kimo1972 » Thu Sep 02, 2021 3:11 pm

Evinrude 115 2012 changes gears. When the boat is at full throttle, it runs about 17 mph. After about 5 minutes of running, it sounds like it switches to a higher gear and we gain about 2 mph to 19 mph. What might cause this? I have changes the spark plugs and the fuel filter with no change.

User avatar
Marc K
Posts: 742
Joined: Fri Jun 01, 2018 4:35 am
Location: Eustace, TX

Re: Evinrude 115 changing gears

#2 Post by Marc K » Fri Sep 03, 2021 6:52 am

Knowing RPM would help immensely.
Big and ugly but we love our 1999/2000 Crest II DL with a Yamaha F115

Kimo1972
Posts: 2
Joined: Wed Aug 05, 2020 11:27 am

Re: Evinrude 115 changing gears

#3 Post by Kimo1972 » Sun Sep 05, 2021 12:54 pm

At the 17 mph, RPMs between 40 and 50. About 45. Kicks up to 19mph, RPMs got to about 52

riplipper
Posts: 280
Joined: Tue Jul 17, 2018 8:00 am
Location: St Augustine, Florida

Re: Evinrude 115 changing gears

#4 Post by riplipper » Sun Sep 05, 2021 1:07 pm

my first guess would be fuel flow...
Maybe primer bulb problem or fuel line problem.
Or maybe linkage issue at the motor
I am the guy at the boat ramp that gives you dirty looks when you are a complete idiot and too stupid to know it.

User avatar
Marc K
Posts: 742
Joined: Fri Jun 01, 2018 4:35 am
Location: Eustace, TX

Re: Evinrude 115 changing gears

#5 Post by Marc K » Mon Sep 06, 2021 6:59 am

If I am understanding you:

Wide-open throttle is around 4500 RPM at first, and that gives you 17 MPH.
Then the RPM suddenly jumps to 5200 RPM which results in 19 MPH.

Most outboards should run at around 5600-6000 RPM wide open.
What is the maximum RPM rating for your model?
Have you ever seen higher than 5200 RPM?

What is the result of adjusting the trim up and down while running wide open?

Marc
Big and ugly but we love our 1999/2000 Crest II DL with a Yamaha F115

Post Reply