Rpms jumping

Buzz328

Cadet
Joined
Aug 24, 2021
Messages
6
Looking for some suggetions.
We have a 2015 22ft Party Barge DLX with a Mercury 115 CT. We used to cruise at around 25 mph at 5000 rpms. Now we can get up to 17 mph at around 4200 rpms but if we try to increase, the rpms jump up but the mph goes down.
Here's what all we've done: changed the fuel filter, spark plugs and the instualled new hub kit. Also had some water drained from one tune and had a cracked weld fixed.
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
50,282
is the prop ventilating when you try to go faster?
 
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