Re: 82' Merc 115 inline 6, no power, 15MPH at 5200 RPM


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Posted by Ken Denman (24.77.36.232) on July 14, 2005 at 19:29:43:

In Reply to: 82' Merc 115 inline 6, no power, 15MPH at 5200 RPM posted by Jeff T. on July 14, 2005 at 15:19:44:

Generally, you trim the motor down after you come out of the hole.

A motor sucking air in planing attitude usually means that the motor is placed too high on the transom, or in rare cases, parts of the anti-cav plate are missing.

Are you sure you are pulling air? When a motor revs high with no forward movement of the boat it may also mean that the prop has spun -- that is, the rubber hub has broken down and is loosing traction with the prop housing. If you can, borrow a buddies prop to see if you get the same symptoms. If you can't , scribe a light mark that lines up on both the prop and the splines, take it out for a spin, then check after. If the marks no longer line up, then you have a spun prop.


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