1977 55 HP Evinrude

[skip44820]

Guess same as when. It erodes nail polish

 

[Crosbyman]

Skip... if worried about mail polish to seal the top plug keep in mind it is only there to seal the plug and not much exposed from the fuel

as to super glue being dissoveld I have sealed some cork float with no problems..yet


some nail polish contain the same stuff used in "air plane dope"
methyl butyrate... or something to that effect

 

[skip44820]

Let's talk about the screws I don't have. Van I get them at hardware store. What is their purpose

 

[racerone]

Repeat.----#38 and #35 are fixed " calibrated " jets.-----They are put in snug.----They are NOT adjustable !

 

[skip44820]

because I am missing the 2 screws is that the reason the motor will not stay running?

 

[racerone]

You are not missing any adjustable mixture screws on your motor if it has the original factory carburetor.

 

[skip44820]

Would someone just please answer question. The missing screws, r they the reason this motor will not stay running. Period....

 

[Crosbyman]

skip... you are not missing screws...if you think you do.... post a picture to better explain you point....aside from that, consider visiting a shop to help out.

orifices are hidden behing cover plugs and you indicated the engine runs on choke "Rebuilt carbs, new fuel pump. Runs on choke" so what you have is a fuel flow problem.

you did open the vent on the tank ???

 

[racerone]

Screw #30 and gasket #29 are missing in picture on post #12

 

[Crosbyman]

yes ...they are ... good eye but at what stage was photo taken ..?. hard to believe previous owner left them out ! :-(
a good test run would have prevented all this chasing ...

what else is going to be missing :-(

 

[skip44820]

skip... you are not missing screws...if you think you do.... post a picture to better explain you point....aside from that, consider visiting a shop to help out.

orifices are hidden behing cover plugs and you indicated the engine runs on choke "Rebuilt carbs, new fuel pump. Runs on choke" so what you have is a fuel flow problem.

you did open the vent on the tank ???

Yep, I've done all that I figured I had a fuel problem. Soaked the carbs overnight.ran carb cleaner. Then com
Blu with carbon cleaner and airrrrmh

yes ...they are ... good eye but at what stage was photo taken ..?. hard to believe previous owner left them out ! :-(
a good test run would have prevented all this chasing ...

what else is going to be missing :-(

Im not giving up/ Came home from work thought I would order 2 more carb kits and take these apart since I used super glue to seal the shinney little metal caps and I got scolded for that. Now I have to clean all the dried glue off cause I took all 6 of them out. I ordered Mexican dinner for me I can think better when not hungry, thought I would turn you tube on and watch how to rebuild a 55 hp evinrude carb, low and behold 1 popped right up. I started watching it and nearly **** myself. When the guy took the bottom off the carb, removed gasket, removed float, then needle was on a small spring attached to the float. I said STOP.HOLLY **** I AINT GOT 1 OF THEM LITTLE SPRINGS ATTACHED TO THE FLOAT.Thats why I don't have any fuel. Thought I would share this with you guys that have been working with this old man. I got all the **** soakin, waitin on carb kits. Just took motor off the boat and put on stand. Ill keep u up to date. Give me a couple days. Thanks to all

 

[racerone]

Don\t use any kits other that factory " original quality " parts.

 

[Crosbyman]

the small float spring is just a helper to pull out the inlet needle in case it is stuck... the needle should....drop on it own under the incoming fuel pressure from the pump.

take care of the main issues

 

[skip44820]

This is bad. I thought I found the problem, with no spring holding needle to float. Back to drawing board. They r soaking. When I put plugs in do I use clear finger nail polish?

 

[Crosbyman]

It is my method but it is just " in case" the plug leaks. I only remove the top dime size one... never the small ones !

any gasket type sealant can be used to dab the rim of the cover plug
or simple nail polish which will quickly harden and seal.

if you prefer do not apply any sealant ... clean the rim then install the cover plug and tap it in so the rim expands properly.

 

[skip44820]

It's strange with 2 carbs , u would not think both carbs would b plugged so motor only runs on choke. Strange!

 

[Crosbyman]

if your carbs are truly plugged the source is usually common... fuel related

bad fuel stale etc...
dirty fuel ( incl crumbling/defective fuel hose)
dried fuel in carb passages
watery fuel
dirty rusty tank and crud etc... incl fuel pick-up , fuel connectors
bad / inoperative venting will impeed fuel flow /delivery to the pump
dirty fuel pump screen filter
etc...
proper fuel filtering is essential to motorboating happiness.

anything is possible engine wise incl poor crankcase vacum to pull the fuel from the carbs... not so frequent but a possibility

start with the easy stuff ... but some shop time may be the best approach
here.

yes costly but part of experience building

 

[skip44820]

if your carbs are truly plugged the source is usually common... fuel related

bad fuel stale etc...
dirty fuel ( incl crumbling/defective fuel hose)
dried fuel in carb passages
watery fuel
dirty rusty tank and crud etc... incl fuel pick-up , fuel connectors
bad / inoperative venting will impeed fuel flow /delivery to the pump
dirty fuel pump screen filter
etc...
proper fuel filtering is essential to motorboating happiness.

anything is possible engine wise incl poor crankcase vacum to pull the fuel from the carbs... not so frequent but a possibility

start with the easy stuff ... but some shop time may be the best approach
here.

yes costly but part of experience building

Yes the shop visit is just around corner if my last carb cleaning don't fix all this. I bee n debating on another motor as well.

 

[skip44820]

normally 3 times a charm. Not this time. Bummer. Another $85 for 2 rebuilt carb kits same problem, I am Bummed out, sorry guys

 

[Crosbyman]

if you have good sparks.... if the carbs are clean....., if the fuel is fresh the engine needs to suck that fuel out of the carbs thanks to the crankcase negative pressure ( aka vacum) during the piston up strokes.

when piston come down the pressure builds up and expels that fresh load of fuel/oil into the cyl ..... if the reeds do a good job acting as a one way valve. Fuel has nowhere to go but into the cyl. cavities to be ignited

Assuming the reeds are ok then you may be missing sufficient upstroke vacum to extract fuel from the carbs.

You should be able to feel that suction with your hand while cranking the engine. A simple piece of paper should also slam on the carb face during cranking and.... should not be pushed away during the down stroke if reeds are ok. (closing properly)

there is a a way to test leaky crankseals on utube (DANBAR)

so goes the theory......