90hp Mercury Sport Jet feels like a spun hub... help

FSU_boats

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Jun 26, 2017
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I am working on a 90hp Mercury Sport Jet drive. It will try to plane off and then will rev higher and slow down. I am an outboard man but this feels like a spun hub. However, the impeller doesn't have a hub. Do the splines and grooves in the impeller go bad with time? or does the drive shaft wear out? The impeller splines look a little more worn than the prop shaft splines. Any thoughts?
 

alldodge

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Mar 8, 2009
Messages
40,582
Howdy

There are several 90hp sport jets, what is your serial number or at least a year?
 
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