6 hp evinrude carburetor problem flooding

[Matt V]

Re: 6 hp evinrude carburetor problem flooding

also let me ad that turning the adjustment needle does not change anything. you can screw it all the way in or turn it out in increments and it makes no difference at all.

I'm having the same problem with a customers 1994 8hp, low speed fuel needle was impacted ( turned in ) too much, upper plastic valve body is trash.

 

[johnevin24]

Re: 6 hp evinrude carburetor problem flooding

ok, i also replaced all the hoses from my fuel tank as well. and yes the vent was open on the tank. i checked EVERY nut and bolt on the powerhead to make sure there all tight. the motor has good compression (this is a very low use motor) . all of your suggestions all make sense but theres something here thats missing. im sure its a very simple thing but there the ones that make us nuts, lol. any and all thoughts are welcome and very appreciated,thanks again.

 

[AlTn]

Re: 6 hp evinrude carburetor problem flooding

k..it's common for some fuel to come out the front of the carb throat when the choke is on...I recall getting a new idle mixture needle for a friend's 6 hp. about the same year as your's...the contour was longer and thinner than the one in it and it make a big difference in setting the idle....I don't recall the midrange and top end changing much fwiw...those needles aren't cheap....btw...does your needle in the seat have the rubber tip or is it all metal?....the BRP kits seem to have gone away from the rubber tipped needles

 

[johnevin24]

Re: 6 hp evinrude carburetor problem flooding

Hi and thank you, the needle is all metal and theres no rubber. its in great shape as the tip is actually almost round. I HAVE A 6 HP CARB FOR SALE FOR $100 OR WILL TRADE FOR NICE WORKING CARB. (LOL) only kiddin. again anyones input is welcome,thanks again.

 

[Cap'n Chaos]

Re: 6 hp evinrude carburetor problem flooding

It still sounds like your slow speed idle circuit is clogged or restricted.

When you removed the slow speed needle to clean the carb did you make sure to get all of the old seal out of there? Mine were made of what looked like compressed cardboard and were very fiberous. It was not fun getting them out. I also saw that my needle was very blunt, and I suspected the tip of the needle was broken off and lodged in that deep recess...luckily it was not. Have you inspected the needle itself? It should be very sharp and smooth. When you remove the welch plug and screw the slow speed needle in you can see the tip of the needle through the welch plug opening. I made a mark on mine so I would know where the "bottom" was when it was fully seated and then backed it out 1.5 turns.

Did you use a new gasket behind the carb? Have you tried spraying carb cleaner around the carb/ intake manifold gasket while it was running to see if you are sucking air from there? Carb cleaner will make the engine stall out or at least you will hear the RPM drop or the engine will change pitch.

Are you sure the carb buttlerfly is opening as it should?

Sorry you are having so much trouble, it took me a month of tinkering before I ever go my 1965 6HP running correctly. I had to clean the carb at least twice, and was inside of it 4 times before I actually got it all clean and set correctly and is why I mentioned the boss gasket. Getting the points set correctly was also a challenge for me. That is the best runner I have in my "collection" now.

 

[Crosbyman]

Re: 6 hp evinrude carburetor problem flooding

imho good compression won't do zilch for the engine's ability to suck the proper air/gas mixture from the carb.

if any air find's its way into the crankase area behind the piston that extra fesh air will prevent a good dose of air/gas being suck in from the front of the carb.. the next compression stroke will simply compress gasless air into the piston which the sparkplug will fail to ignite.

can you feel a good pull of air on the carb's front (choke off) when you put all fingers across the openning. the compression stroke will be like your rib cage expanding... air should rush into the carb face. if you feel a good "pull -in" then tha carb is not allowing normal fuel
flow to mix with the "rushing-in" air. ...back to the carb

BTW did you blow (90 lbs+) air in all passages aftre soaking the carb ??


you do have the proper gasket for that carb?? most of those carbs low speed circuit will channel gas up to the low speed needle via the side channel.
it is very important not to block out the channel with a wrong gasket . looking down in the carb the l/s channel feeding the upper needle and drip chamber under the plug.... is on the right side.

 

[johnevin24]

Re: 6 hp evinrude carburetor problem flooding

Hi cap, and thank you. Today i took the carb apart again and fucused on the slow idle needle. again i removed everything from the carb including the welch plug again. when i look inside under the welch plug there are 4 small holes on the bottom. on the side where the slow idle needle stops, theres a tiny hole that lines up directly where the tip of the needle should stop.the end of the needle is ROUNDED and theres no point and it appears that the end of the needle valve is broken off and stuck inside the hole. i went to marineengine and looked at the needle and it shows it has a point at the tip and is not round. so i think that the end is broken off and that certainly would be a problem. and i dont have a clue how to get the tip out without destroying the seat. BUT im not sure if the low idle should be round or not. after putting carb back together now it will run WITHOUT the choke on at high rpm but shuts right down at half throttle or lower. so now im getting even more confused. i also again put 2 more new gaskets in the needle seat (packing washers). so thats where im at now.

 

[johnevin24]

Re: 6 hp evinrude carburetor problem flooding

just wrote a long response back to you cap,but dont know where it went.

 

[Tim Frank]

Re: 6 hp evinrude carburetor problem flooding

The needles have quite a sharp point.
I have the same motor and the OEM manual. It has a good picture.
They do not recommend trying to reshape the needle, get a new one.

The good news is that this problem explains your symptoms completely.


From another post on the subject

Here is one way I haved fixed that problem, that is if this a carb from the older twin cylinder. With the carb removed, remove the soft plug on the top of the carb. You will see the hole where the needle come's into this cavity. Drill a hole on the back side of this cavity the size of, or slightly larger then the needle valve hole. Drive out the broken needle valve tip with a steel pin. Make the pin from the shank of a drill bit if nothing else is handy. Drive a lead slug of solder into the drilled hole, and replace the core plug. Don't worry about any slight damage where the needle was stuck. That needle is adjustable, and the engine will never know the difference. Don't worry about the lead slug, it's a lot smaller then that core plug you have to drive back in. I did'nt catch at first that this was a twin forty. This method will work just fine

 

[Cap'n Chaos]

Re: 6 hp evinrude carburetor problem flooding

Glad you figured it out.

I've actually used some 800 grit sandpaper and sharpened the slow speed needle before... but you can find them around still. I think they are about $40 new.

Once you get a new needle or repair your old one you'll be able to get it running correctly. Just remember when you seat it (srew it all the way in) DO SO GENTLY or you will break the tip on the needle all over again. You'll want to back the needle out about 1.5 turns... it could be 1 turn or 3 or anywhere in between, every motor is different.

You will be able to tell when you make the adjustments, give it about 30 seconds between adjustments until you find the right setting. You'll notice the RPM increase as you screw the needle in, if it starts jerking "sneezing" you've got it too lean, so back it out about a half turn and you're all set.

Once you get to this point you'll want to synchronize the timing and carb... if the throttle response is sluggish or slow.

Let us know if you need a hand.

 

[Crosbyman]

Re: 6 hp evinrude carburetor problem flooding

today i took the carb off again then pulled the welch plug. INSIDE WAS CLEAN as can be. I put n new plug


ha ha.!! that was the critical stage.... flushing the low speed channel with carb clean would have shown the problem.

Carb cleaner should have come up the side channel and flood the idle circuit chamber where the small drip holes are located !! Running compressed air would also have shown the problem since no air would have entered the idle chamber !!

Another beauty save from the the junk pile !!

Don't worry, I missed a badly crudded up JW fuel cap till someone told me to look again...and again...

 

[johnevin24]

Re: 6 hp evinrude carburetor problem flooding

ATTENTION ALL I FIXED IT. Ok, i became more focused on the needle slow adjustment as it did nothing when turned. today i took the carb apart again,removed the welch plug (3rd time) and decided to try something as i figured had nothing to lose at this point. i drilled a tiny hole where the tip of the needle should come out and or stop, BECAUSE the hole had the tip of the needle that must have broke off. again i drilled a tiny hole through the wall (the end of the needle is now ROUNDED OFF. I put the welch back on and then put carb. back on motor, then screwed the adjustment needle all the way in then just turned it out just a touch. i pulled the cord and it started right up and idles better then a new 2014 engine and runs excellent. Im a happy man, and if anyone needs advice on carb problems please let me know as im now a expert carb fabricator, LOL.

 

[nwcove]

Re: 6 hp evinrude carburetor problem flooding

thats great john! betcha you can assemble that carb blindfolded by now!!