Tach issue 1996 Aquasport and Evinrude

[czizza]

Last week I replaced my water pump and started the engine after the winter storage it runs a little fast however now my tach reads 4000RPM when idling ... I know this is wrong because I know the engine is not at 4k. I do see the volts at 15 to 16 volts.

Do the tach gauges go on these boats?

[RickK]

I see about 350 rpm not 4k.  The "1" is 1000/1k.  Maybe I'm missing something?
Seems 350 is pretty low too, mine run around 700rpm at idle.

[czizza]

That was just a picture to show the type of TACH I have, just in case forum users are knowledgeable about the actual unit. I took that picture years ago.

[Bergertime]

Tach issues point towards an electrical issue which you definitely have if you are getting that much voltage at idle.  I would look to confirm the major components of your engine are working as designed starting with the stator and rectifier. It may be your gauges but unlikely.  I had an issue with my stator that was causing low voltage and my tach to act strange with erroneous readings .  Anyway, others will be by to lend their expertise but I am guessing that it will likely be centered around one or both of those components.  As a side note: I would be careful if you are truly getting 16v because it could damage other components on your boat that are designed for 12v systems.  Certainly not an expert here but I would be prudent until you know exactly how much voltage is being sent to the house system... don't want to add to the list of repairs you may eventually have.


B

[czizza]

Took her out today tach was wacky for a while but then by the time we hit the channel it was good and working. It worked all day. Weird.

I did notice at idle volts 13.9, at 3000 rpm 15 at 4000 15.4 and at 5k 16v. Do you think regulator? 1996 Evinrude 150 carb.