Evinrude E-NATION, for those dedicated to water, power, fishing and fun
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Skipper
Posts: 5
Registered: ‎07-10-2016

Erected 90 HO

What occurs at about 4500 rpm that gives the surge of power and sound change. What is the optimum rpm to cruse at on these motors.
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Admiral
Posts: 7,054
Registered: ‎07-14-2011

Re: Erected 90 HO

The V4 engines have a tunable exhaust valve that normally "kicks in" about 4500 rpm and you can feel the rush of  power.

 

Cruising rpm is your comfort level in various boats, motors, and water conditions - somewhere between 3500 - 4500 rpm

 

 

 


"There is never just one thing wrong with a boat";
                    -- Travis McGee, main character in a book series by John D. McDonald 


 



***************

The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.

The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.


Skipper
Posts: 5
Registered: ‎07-10-2016

Re: Erected 90 HO

Some times I get that surge and sometimes not. Yesterday at 4600 I hit full and it went to 4800 and no surge. Then after backing off to 4600 and cruising for several minutes then it changed and I again was able to go to 5300. Sticky exhaust valve???
Admiral
Posts: 7,054
Registered: ‎07-14-2011

Re: Erected 90 HO

 

 

Possible sticky valve but it is computer controlled which determines the load on the motor, rpm, temps, and the rate of acceleration and throttle input. There is no set rpm or time.

 

 

 


"There is never just one thing wrong with a boat";
                    -- Travis McGee, main character in a book series by John D. McDonald 


 



***************

The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.

The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.