1995 evinrude turns over to slow 50hp

[sambrigman]

1995 evinrude 50hp hardly turns over. I have changed starters. new battery cables", heavy"cables new battery, high cold amps. When I remove plugs it spins super fast. I have good ground and heavy hot cables. This is all I know to do. Any advice greatly appreciated thanks guys

 

[racerone]

Did you install a factory new starter, Yes or no ?

 

[sambrigman]

no, I took the starter from my 75hp evinrude, it starts the 75 fast

 

[racerone]

Both are 3 cylinder I assume ?------Your trouble shooting approach may differ than mine.-------Take battery back to where you bought it and have it load tested.------If it is PROVEN to be a good battery then take starter apart.----------Inspect brushes.---Take ohm reading from shaft to the commutator with a digital meter.------Should read infinity.-------------Do the same test on the other starter that you replaced.

 

[crazy charlie]

Load test the battery.sounds like it cranks when there is no resistance/compression and when under load it struggles.The battery may seem good but fails under load.Charlie

 

[sambrigman]

well i have tried different battery including new, the 50 is 2 cylinder the 75 is 3 .just had lower unit rebuilt ? Could there be a problem there? thanks sam

 

[racerone]

Are 100 % sure these starters are the same ?