60 hp will only go when choked ..carbs rebuilt.

[fishfeatures]

I am at my wits end here so please advise,

1990 60 hp johnson

I was originally having running issues so striped and rebuilt carbs inc. welch plugs. They were all cleaned as best they could be. All fuel lines replaced from the tank to carbs

Ran ok for a week then bang more running issues, eventually turned out to be an intermittent power pack. have changed the pack for a new one and boy is the differencce in spark huge.!!

Now the darn motor will only run when choked. I am the lync and sync king and have done it so many times i can do it in my sleep. Compression is all within spec so that's that out of it.
carbs clean and brand new spark check with tester so I know that's good.


But will only start in water or muffs when choked, it will die within a few secs when choke is released. I thought fuel pump so disconnected from carbs the fuel lines and turned the key and fuel pulsed out of all 3 lines so the pump works.

I can't keep it running long enough to check timing , but going by J Reeves method the timing is set.


I know that if it's choked the carbs are by passed as such so it has to be the carbs doesn't it???

any help please!!!

 

[boobie]

Re: 60 hp will only go when choked ..carbs rebuilt.

I vote for the carbs.

 

[fishfeatures]

Re: 60 hp will only go when choked ..carbs rebuilt.

I vote for the carbs.

I'm leaning that way too but the carbs are spotless , got a good soak , every hole ranthrough with wire adn carb cleaner , and the whole thing then got a good going over with compressed air.
While it's running sometimes when I knock it into gear and go to WOT it'll fall flat on it's face, which I was thinking is a timing issue, and as I said J reeves method has it where it should be but now that I can't get it running I can't double check it at WOT.

 

[Haffiman]

Re: 60 hp will only go when choked ..carbs rebuilt.

Pull the carbs, replace gasket #18.
http://www.marineengine.com/parts/j...LESM&manufacturer=Evinrude&section=Carburetor
When both gasket #18 and #7 are on the bowl and the housing put loosely on top, it must be a gap between housing and gasket #7, Gasket #18 must be thicker!! If not, carb will suck air and not fuel.
Be even sure to remove jet #14 when cleaning, and not just clean when in place.

 

[fishfeatures]

Re: 60 hp will only go when choked ..carbs rebuilt.

Pull the carbs, replace gasket #18.
http://www.marineengine.com/parts/j...E60TLESM&manufacturer=Evinrude?ion=Carburetor
When both gasket #18 and #7 are on the bowl and the housing put loosely on top, it must be a gap between housing and gasket #7, Gasket #18 must be thicker!! If not, carb will suck air and not fuel.
Be even sure to remove jet #14 when cleaning, and not just clean when in place.

Haffiman,
#14 was removed when carbs were done.
I'll source #18 , can you tell me what purpose it serves as when i look at it, it just looks like an wierd shaped gasket that goes over the emulsion tubes , i can't see what work it does..

 

[Haffiman]

Re: 60 hp will only go when choked ..carbs rebuilt.

All fuel 'needed', both for idle and high speed goes through the main jet #14. For that to work, it has to be a vacuum inside the channel from the top, all the way down to #14. If gasket #14 is not 100% sealing, it will suck air and not fuel as it is above the fuel level in the bowl. Same problem will arise if the brass tube is leaking air between the tube and the upper carb body.

 

[fishfeatures]

Re: 60 hp will only go when choked ..carbs rebuilt.

Haffiman ...... close but no cigar.... problem i think has been located and, I have small cracks in the pick up tubes in 2 carbs. These are probaby the cause of my trouble i believe .
I have an old set of 70 hp carbs the one with the choke plunger and butterflies, I reckon I can throw these on and they'll work. I've already checked if gaskets fit and they do , so I'll throw these on after a cleaning, along with the floats and needles and seat etc. Can't afford a new set of OEM carbs right now so fingers crossed.

Now can anyone tell me what leads to cracked tubes? is it common? or have I done something to cause this?

 

[daselbee]

Re: 60 hp will only go when choked ..carbs rebuilt.

When it won't stay running for more than a few seconds, it tells me that the fuel supply for the idle circuits is clogged.

The fuel supply for the idle circuits is typically a small brass tube extending down from the carb top body. Sometimes it is inside the larger brass tube which is the HS fuel supply.

So, find that small brass tube, or the equivalent fuel flow circuit for idle, because yours may be slightly different than mine (90's V6 loopers, plastic carbs) and make sure it is clear.
I use a long welding tip cleaner to run thru them. You may think that they are clear because you blew air into them, but the sure fire
way to tell if they are clear is to suck on them like a straw. You cannot tell by blowing, you must pull on them, and you can feel the air hitting your tongue.

There are small holes in the side of the throttle venturi, right at the butterfly. Those, and the passages leading to them must be clear.

EDIT: I wouldn't worry about the cracked tubes. That seems to be common, and is unrelated to the idle fuel circuit.

 

[fishfeatures]

Re: 60 hp will only go when choked ..carbs rebuilt.

well I swopped over the carbs to the old 70hp ones and it sorted my idle issues out , so there must have been some problem with the brass pick up tubes for both high speed and idle. Would never have thought of that area being my problem so thanks for all the helpful info guys.