High RPM

chimneyman

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Joined
May 17, 2011
Messages
848
Location
blount co
Got a 2022 mercury 115 even when breaking it in the rpm's would go to 6400-6500 talked to the dealer he said might be bad tach so put another on it still registers 64-6500 dealer said it has safety system built in it that will cut it down if needed. I never run any boat over 3/4 throttle so not really a big concern but just wondering if there's anything I should do now. Got 5 yr warranty thanks
 

chimneyman

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Joined
May 17, 2011
Messages
848
Location
blount co
EE10C445-E54C-428F-9C66-884B751C6E80.jpeg
EE10C445-E54C-428F-9C66-884B751C6E80.jpeg
 

chimneyman

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Joined
May 17, 2011
Messages
848
Location
blount co
20 ft sea ark deck boat. Talked to a mechanic he said tach just needs adjustingsupposedly there a screw on back you adjust. He said my motor will start shutting down at 6100. It now runs great at 6600. So should be easy fix
 

Spurhunter

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Joined
Jun 9, 2008
Messages
15,198
Location
Munford, TN
20 ft sea ark deck boat. Talked to a mechanic he said tach just needs adjustingsupposedly there a screw on back you adjust. He said my motor will start shutting down at 6100. It now runs great at 6600. So should be easy fix
I installed a NMEA 2000 network so my graph would display the true RPM reading from the computer. I had doubts that my tach was accurate.
 

Pilchard

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Joined
Jan 5, 2018
Messages
3,517
Location
Dreaming of Tarpon
20 ft sea ark deck boat. Talked to a mechanic he said tach just needs adjustingsupposedly there a screw on back you adjust. He said my motor will start shutting down at 6100. It now runs great at 6600. So should be easy fix
I'd recommend you hook it up to the computer first and make sure it isn't truly getting into the range your tach says.
 

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