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1998 225 HP Mariner Sluggish Under Load between 1750 and 2200 RPMs

gagdavis

New member
"I have a 225 HP Mariner on a

"I have a 225 HP Mariner on a 20 ft Bass Boat, 4 Blade SS Prop, 14" 23 Pitch. It runs great at idle and runs great above 2200 RPMs once it reaches this speed, but struggles between 1750 and 2200 with 3 people in the boat. With 5 in the boat (extra weight), it never can get past 1850 RPMs. I've put new spark plugs in, checked the compression and everything seems fine. What's next?"
 
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