once rev'd it doesn't slow down fast

[skinny1965]

Ok the 66 evinrude 40 hp that I got runing in a pail with no load in netural. once you rev it up say 1/2 way and go back to what should be idle it stays reved for a bit and slowly comes back down is this normal someone said it could be due to no load.

it seems that once you reach a certian point in the rpm it does this. I was thinking it might be sucking air. if that is true then why not a issue all the time at any rpm

 

[Daviet]

Re: once rev'd it doesn't slow down fast

Is the mag plate rotating freely and not binding?

 

[skinny1965]

Re: once rev'd it doesn't slow down fast

never checked it can you give me pointer to look for
or how to check

 

[F_R]

Re: once rev'd it doesn't slow down fast

Whoa there!! In the first place why are you revving it up half way in a bucket? You are an intelligent person and came here to ask an honest question, so I won't suggest that was a dumb thing to do.

OK, now that you agree to stop doing that, I'll explain. The 40hp motors are extremely prone to a condition called "runaway". That occurs when you rev it up in neutral, or any other time it happens to be revving with no load, such as a lost prop. Once it starts to run away, sometimes it won't want to slow down at all. In fact, it is such a normal thing, that OMC put a special switch on the motor for that very purpose. It is called a vacuum cut-out switch. It senses a run-away condition and cuts out one cylinder till it slows back down to a normal idle.

It sounds like your motor is acting completely normal, and doesn't need any fixing. Just stop teasing it.

 

[skinny1965]

Re: once rev'd it doesn't slow down fast

well that answers a bunch of stuff now I just hooked up the cut out switch once again

the reving up was like a quick there and back (just a snap) mostly because this motor is all new to me and to true pond/lake test is at least 1/2hr away and I'm still finding issues this was one.

I will get the switch hooked back up and hope it goes away

thanks for the reply