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Engines Running Rough on Hose

DRock3d

Jet Boat Lover
Messages
97
Reaction score
61
Points
77
Boat Make
Yamaha
Year
2013
Boat Model
Limited S
Boat Length
24
When doing my oil change and spark plugs on my new to me 2013 242 LS it seemed like the engines ran rough and had a little shake when running on the hose. Is this normal or should they run smooth as glass?
 
They should feel the same but they will sound a lot louder out of the water. Like a can of bolts and marbles being shaken because the impeller is not mufflered by water.
 
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