1965 Evinrude 90hp - problemos'

[petermuhis]

hello everyone

i am new hear and i have a 1965 evinrude starflyte 90hp engine. I just bough this engine for $200, it was rebuilt. All cylinders have equal spark, and compression. The carbs were jsut cleaned out, and a new distributor was put on. Now, the problem:

the engine will idle fine. but when i give it gas it wont rev high at all, probuably sounds like half of the potential(i dont have a tach). I dont know what could cause this, it sounds like boggin? but i dont think it is... then when i pull back the throttle to start, it still stays revving high for a while, then slowly comes back down to idle. its weird.

another thing is, do i have to let the boat sit in the water and warm up for a bit before i use it, im asking this because of my choke, its tha HEAT CHOKE. and i know nothing about this. I dont even know how to set it up correctly to run properly, like where the top setting should be.

And another thing, could this non revving high issue be because of timing?
is there anyway i could fix this on my own before handing it over to $$$$$marinas? I am mechanically inclined and can pretty much accomplish anything..

please help out with my problem!! if u need pictures or more informatiion just ask and i will provide..

thanks again.

 

[jonesg]

Re: 1965 Evinrude 90hp - problemos'

Sounds a bit cheap for a rebuilt 90 eh?
$200!

What was done and not with the rebuild? did they rebuild the carbs?

You can't rev them up on the hose, if thats what you did the engine can run away, thats why it didn't shut down with the throttle.

I would order the factory service manual and go through the engine, get it all set per the book, don't bother with aftermkt manuals.

get your manual from,
www.kencook.com

and post your model if possible, it helps others help you.

 

[petermuhis]

Re: 1965 Evinrude 90hp - problemos'

hello,

yes i do have a manual and i have tried everything,,, but ionno why it wont push the boat fast,, just trolling like 10mph, it sounds like its bogging but i dont think it is,, it just wont rev up, even when it it in neutral it wont rev up.

what does runaway mean?

i dunno what to do im at my wits end. The rebuilt was of the pistons, and everything was done correctly. The carbs were rebuilt and are good, the spark is fine, it has to be adjusting for something? did i miss something?

 

[petermuhis]

Re: 1965 Evinrude 90hp - problemos'

sry guys, its a Starflyte 90hp rom 1965.

 

[Evinrude Boater]

Re: 1965 Evinrude 90hp - problemos'

Welcome to iBoats Peter. Don't assume that what was done, was done correctly. Check to make sure. If the distributor was changed then it needs to have Link & Sync done again. Timing is probably OK since it's just a matter of aligning timing marks, the linkage advances the timing as you go faster.
Runaway occurs when you rev the engine too high in neutral. With no load on the engine it can keep running fast with the throttle backed off.
I sent you a PM with more info. Good luck.

 

[petermuhis]

Re: 1965 Evinrude 90hp - problemos'

its a starflyte 90hp,

question: If my feul pump on the motor was done, would the motor still run like i explained?

 

[Evinrude Boater]

Re: 1965 Evinrude 90hp - problemos'

question: If my feul pump on the motor was done, would the motor still run like i explained?

Not likely. To be sure take the fuel line off between the pump and the carb and put it in a container while you crank the engine over to see if it pumps fuel. Is your fuel tank vent open? That will cause problemos.

 

[coolguy147]

Re: 1965 Evinrude 90hp - problemos'

200$$ is pretty cheap for a rebuild motor


have u checked compression make sure it fine to use and restore? and by the way make sure u replace the impeller cause u dont wnat 200$$ going down the drain from a over heated motor

 

[OldJohnson6hp]

Re: 1965 Evinrude 90hp - problemos'

Shot in the dark..

Worn cam follower not opening carbs up enough? Would idle fine, and can cause engine speed to vary..this happened on mine. Although I'm not sure the specs of your motor.

 

[petermuhis]

Re: 1965 Evinrude 90hp - problemos'

hey thanks,,

evinrude, you know on your motor, if i were looking at the left side of the motoor(the side with the feul pump on it) and if u look down, just above the prop maybe like 8" and to the left(closer to the boat) you have that black open hole? what is that hole for? does it have to be in the water? and what if its pluggeed?

 

[F_R]

Re: 1965 Evinrude 90hp - problemos'

Don't start looking at holes. Have you checked to see if it is running on all four cylinders? Obviously, it isn't. Once you know which cylinders aren't doing anything, you can zero in on the cause.

OR, if not that, yes the timing can be off. I'm speaking of the timing belt. Timing and synchronizatin is all related and must be done correctly, according to the book.

DON'T be revving it up in neutral. If it were running correctly, you could explode it. At the least, you could experience dangerous runaway.

Ok, the hole: A picture would help, but are you speaking of a large hole, bigger than a pencil but smaller than your pinky finger? That is a drain hole for water that escapes from the water pump. Don't even think of plugging it. There are a bunch of smaller drain holes too. They were all put there for a reason.

 

[petermuhis]

Re: 1965 Evinrude 90hp - problemos'

hello, thanks,,

um like i said above in the first post all four cylinders firing, and good compression in all. But that hole does have a cap on it, obviously it was an add on. What kind of damage could that have done? or could that be the reasoning?

 

[Starppy]

Re: 1965 Evinrude 90hp - problemos'

Post some pictures or stop obsessing over the hole. Here are the things you need to be concerned about to fix your problem (no particular order)

1. Compression
2. Spark
3. Fuel flow
4. Cooling
5. timing

You say you verified compression. Fair enough. You say you verified spark, OK. Can you verify water flow for cooling? Have you checked the setting for spark advance? Can you verify that the fuel pump is operational and you are getting fuel to the carbs? Have you checked the adjustments for the control linkages?

I'd persoanlly start with verifying water flow to make sure you aren't burning up the engine while you tinker with it. I would then go to the spark advance and timing then on to the linkage and then the fuel.

Read the manual! It should have all the procedures you need to check the adjustment of the things mentioned. If you don't have it, you're screwed.

 

[petermuhis]

Re: 1965 Evinrude 90hp - problemos'

ok ok thanks,,

because its either cooling or timing, so i will look into cooling asap.

no need to get angry, im just asking questions..this motors frustrating lol

 

[Evinrude Boater]

Re: 1965 Evinrude 90hp - problemos'

hey thanks,,

evinrude, you know on your motor, if i were looking at the left side of the motoor(the side with the feul pump on it) and if u look down, just above the prop maybe like 8" and to the left(closer to the boat) you have that black open hole? what is that hole for? does it have to be in the water? and what if its pluggeed?

I think you're referring to the pencil size hole above the water pump location. It's a drain hole. Don't be concerned.

 

[F_R]

Re: 1965 Evinrude 90hp - problemos'

hello, thanks,,

um like i said above in the first post all four cylinders firing, and good compression in all. But that hole does have a cap on it, obviously it was an add on. What kind of damage could that have done? or could that be the reasoning?

You said that it has spark on all four, you didn't say that they are actually firing, igniting and burning fuel in the cylinders.

That motor has a four barrel carburetor, one for each cylinder. Have you removed and inspected the high speed orifices? Do you have the special tool for setting the float heights? Did you replace those complex gaskets?

 

[petermuhis]

Re: 1965 Evinrude 90hp - problemos'

so today i fired it up and it idled fine in the lake,,, with water spraying out correctly.

But it was smoking ALOT, and the smoke was mostly white, but a little thick almost brown..... still doing the BOG..

When it would idle it wouldnt idle smoothly, it would shake a bit while it ran(more than a twostroke motor should)

could this be timing?

 

[Evinrude Boater]

Re: 1965 Evinrude 90hp - problemos'

Could be "lean sneeze". Carb adjustments are discussed on this forum. Search Joe Reeves posts.

 

[petermuhis]

Re: 1965 Evinrude 90hp - problemos'

another thing,, the water started turning all different colours? gas? oil?

lean and rich have to do with the idle screws, i have them all tuurned out 3/4 of a turn from seated.

 

[petermuhis]

Re: 1965 Evinrude 90hp - problemos'

ok guys thanks for your help but i wont be a bother anymore.

in two weeks i will take it to the lake again, take a short video clip of it runing and all the smoke and studdering it does, and then u might get some ideas from the video.

i will post it on youtube then post the link hear.

thanks.