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I have a 1999 mercury 90hp motor on a 1720 Key West. I ran into a sand bar doing about 20 mph. The motor started but would only run at 2000 rpms or less. Once I exceeded that the motor would abruptly stop. I limped home and put the boat on my trailer for maint. What can I do to check out the problem? Is it pluff mud in the motor cooling system or have I screwed up the gears in the foot ?

Submitted: 177 days and 2 hours ago.

Category: Boat

Value: $9

Status: CLOSED

Accepted Answer

welcome to JA

You need to flush the cooling system out from thermostat down
you need to pull water pump and get sand out of there

you could have sheared the flywheel key also, you need to check timing
also if prop is damaged that could be most of the problem also

Expert:	ROCKET
Pos. Feedback:	98.0 %
Accepts:	916
Answered:	5/15/2009

Marine Mechanic

I HAVE BEEN WORKING ON BOATS OVER 25 YEARS

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Accepted Answer

welcome to JA You need to flush the cooling system out from thermostat downyou need to pull water pump and get sand out of there you could have sheared the flywheel key also, you need to check timingalso if prop is damaged that could be most of the problem also

Related Boat Questions

welcome to JA

You need to flush the cooling system out from thermostat down
you need to pull water pump and get sand out of there

you could have sheared the flywheel key also, you need to check timing
also if prop is damaged that could be most of the problem also