Awaking a 1971 evinrude..Need help

[neakdown3]

Ok this has been a disaster from the get go. I want to know whether or not to junk the motor or keep wasting money. K well this is a 1971 Starflite 100 hp Evinrude. Has good compresion all average 115..good spark on all cylinders.. replaced the impeller. new sparkplugs.new gas filter..new lower unit oil.. just rebuilt the carbs with a couple carb kits i got online and carb cleaner.. put it all together.. engine dont sound to good.. a gargle sound sometimes..engine backfires.. it dies with out notice.. i video taped a few minutes of it running..can some one please let me know if you have any idea whats going on here..and if its worth the trouble of messing around anymore with it..spent like 200$ already and i got the motor for 400$..Any advice will be greatly appreciated... i put a video on youtube please check it out..

http://www.youtube.com/watch?v=kLHXpwntOeA

 

[tashasdaddy]

Re: Awaking a 1971 evinrude..Need help

when you did the carbs did you change # 39, remove and clean # 33, run a small wire thur to make sure it is clear. # 38 is the idle mixture screw, follow Joe Reeves directions for setting it.

 

[HighTrim]

Re: Awaking a 1971 evinrude..Need help

Also will spraying pre mix into the throat keep it running?

How about pumping the fuel primer bulb?

 

[tashasdaddy]

Re: Awaking a 1971 evinrude..Need help

see the note on multiple carbs.

Default Carb Needle Adjustments For Asorted Carb Variations by Joe Reeves
(Carburetor Adjustment - Single S/S Adjustable Needle Valve)
(J. Reeves)

Initial setting is: Slow speed = seat gently, then open 1-1/2 turns.

Start engine and set the rpms to where it just stays running. In segments of 1/8 turns, start to turn the S/S needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running.

Eventually you'll hit the point where the engine wants to die out or it will spit back (sounds like a mild backfire). At that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting.

Note: As a final double check setting of the slow speed valve(s), if the engine has more than one carburetor, do not attempt to gradually adjust all of the valves/carburetors at the same time. Do one at a time until you hit the above response (die out or spit back), then go on to the next valve/carburetor. It may be necessary to back out "all" of the slow speed adjustable needle valves 1/8 turn before doing this final adjustment due to the fact that one of the valves might be initially set ever so slightly lean.

When you have finished the above adjustment, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway

 

[tashasdaddy]

Re: Awaking a 1971 evinrude..Need help

we were posting at same time.

 

[neakdown3]

Re: Awaking a 1971 evinrude..Need help

no i did not see #39 . they did send me that in the carb kit but didnt know where it belonged. its that little plastic tip right? how do i get that out of there? and i could not get #33 out do not have the tool. but i soaked it with carb cleaner and blew 120 psi into it. and whats up with #38?

 

[neakdown3]

Re: Awaking a 1971 evinrude..Need help

when u say 1 and a 1/2 turns . thats a 540 right? i was trying to do that. it does seem like it has something to do with that though. are those tips necessary in front of the adjustment needles? Should i take the carbs out again and try to replace those tips?

 

[neakdown3]

Re: Awaking a 1971 evinrude..Need help

what is the premix? i will try pumping the bulb while its running tomorrow

 

[tashasdaddy]

Re: Awaking a 1971 evinrude..Need help

premix is the fuel in your tank, gas and oil mix, never use starting fluid spray on a 2 stroke motor, it strips all the lubrication. picture of tool to get them out is below. i made mine. yes they need to be removed and cleaned or replaced.

# 38 is the idle mixture screw, it is the only one that can be adjusted, the rest are suppose to be tight. it creates the correct air/fuel mixture. follow Joes directions.

 

[neakdown3]

Re: Awaking a 1971 evinrude..Need help

ok thanx for the pics. i willl check those tomorrow...do you suppose that the problem is the carbs for sure? and should the mid section on the motor get hot? and the water that leaks out the lower unit vents gets hot when running is that normal? thanx for all the replys guys

 

[neakdown3]

Re: Awaking a 1971 evinrude..Need help

if i did not replace # 39 could that be the problem? and how would i took the old # 39s out? Honestly i don't even know if i have those # 39's in i have not seen them

 

[HighTrim]

Re: Awaking a 1971 evinrude..Need help

Are you mixing the fuelil 50:1 ?

Here is the same diagram with descriptions for you.Copy and paste without the " "

"http://www.crowleymarine.com/brp_parts/diagrams/20058.cfm"

This may also help some.

"http://www.meegsonline.com/tmd/TMDsVideoChronicle2.wmv"

 

[neakdown3]

Re: Awaking a 1971 evinrude..Need help

yes pretty much

 

[wavrider]

Re: Awaking a 1971 evinrude..Need help

The carbs can make you pul your hair out.

Pre-mix is your 2stroke oil and gas mixture, put it in a spray bottle or squeeze bottle and spray/squeeze it into the throat of the carb to keep it running, this will definately let you know it is carb related.

follow Joe Reeves directions on how to set the carbs and you will eventually get it right, if the carbs are clean before you adjust them.

you have good compression, good spark, get your carbs right and you will be enjoying the engine soon.

alot of good info in the faq section here, and outstanding info from the forum members. Let us know how it goes and if you have any questions just ask, someone will sure reply.

 

[neakdown3]

Re: Awaking a 1971 evinrude..Need help

Could it be possible that the # 39 is stuck inside how would i take those out just turn the carb upside down and it should fall out? i will try all these things tomorrow..thanx again

 

[tmcalavy]

Re: Awaking a 1971 evinrude..Need help

I think you need to invest in an Evinrude Starflight 100 manual, post haste.

 

[Willyclay]

Re: Awaking a 1971 evinrude..Need help

Choke butterflies don't look synchronized in the video. After you work on the carbs some more, you will need to do a complete link&sync by the manual.
Good luck!

 

[tashasdaddy]

Re: Awaking a 1971 evinrude..Need help

you may have stuck thermostats try to get a thermal heat sensor, and check the temp on each head.

 

[evinice66]

Re: Awaking a 1971 evinrude..Need help

is there supposed to be water comin from up top?
do you need an impeller or somthin, or deos it nit over heat....
idk man im maxin righ now

 

[F_R]

Re: Awaking a 1971 evinrude..Need help

That #39 is called a "bearing". It's actually a seal to keep air from being sucked in around through the threads of the adjustment needle. If air does suck in, it will cause a lean condition at idle. That's what I'm hearing in your video...a "lean sneeze". That does not necessarily mean the 39 is bad, it could be as simple as giving the needle a tweak to the left to richen it up. That's what the needles are there for...to be adjusted for best idle. The fact that there are four of them makes it kind of a pain because it's hard to tell which is off. What a blessing when they went to fixed idle jets in the future.

If you can't get it adjusted out, then you'll have to replace the #39s. I use a home made hook to get them out, but have heard that a drywall screw works well too. No, they won't fall or blow out. Push the new one all the way in using a straight punch that fits the center recessed area.

Yes, water is supposed to blow out the top holes. That's your indicator that the pump is working. And yes, the midsection does get warm, it fills up with warm water that has gone through the cooling system and done it's job.