Motor revs under load but won't move

by Tony morgan
(rochester ny 14616)

Hi I have a 1983 carver riviera with twin 305s inboards. My problem is when I put my starboard motor in gear and increase the rpm it a lows the motor to Rev but not spin the prop any faster. When I took the boat out the day before I noticed on the way back in the motor would surge. (I would be cruising at 3000k and all of a sudden it would Rev to 3300k then back down ) it did it a couple of times then stopped. Thanks in advance for your advise

Comments for Motor revs under load but won't move

Average Rating starstarstarstarstar

Click here to add your own comments

Aug 29, 2016
propeller bushing
by: Anonymous

I had a similar problem with my small 20hp mercury 200. I hit something below the water when I had the boat wide open. Turns out there is a safety feature to prevent damage to drive shaft or gears, with a rubber bushing built within the propeller break free when your props hit something hard enough. Props will spin at low rpm but will slip with high RPM's. I bought new props for mine, problem solved.

Click here to add your own comments