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My 1991 yamaha t9.9elrp the motor starts good it runs slow at high speed for awhile then goes to high speed some times without moving the throttle this has been going on for 5years (?)

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: motor fires off great and run good but at full

i had a similar problem with my merc., turned out to be overheating due to a worn water pump impeller. It would overheat and die, then after it cooled down, would restart. Check to see if you are getting a good stream of water out of the, for lack of a better term, "****", usually located at the bottom of the powerhead, on the rear of the motor. If it\'s just dribbling, dripping, or dry you need a new impeller.

Posted on May 28, 2009

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goldbill
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SOURCE: running full throttle and on mercury 60HP and it just quit propelling. it will go super slow in forward and it goes in reverse. what has happened?

Maybe the transmission went out. Take the bottom plug from the lower unit and see if it is full of water or lots of metal in the oil. THEN take a magic marker or a punch and hammer and mark the hub of the prop opposite the blades of the prop and go run it again. If the marks move from one another, you need to have the prop repaired.

Posted on Jul 23, 2012

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1 Answer

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