1972 johnson 25 need carb info wont idle below 1130 rpms

[werewolf]

I finially got it to want to idle but 1130 rpms is the lowest so far it will idle, I have the carb off and setting the float at flush with the carb body and make it even or level , I did notice there is a plastic sleeve inside the main pullover tube [large one in the middle of carb body ] it blocks the small holes in the side of the tube , ive never seen anything like that in a carb on a boat motor ? what would be the purpose of having the holes then blocking them off ?

 

[racerone]

What tachometer are you using ?-----Correctly set for a 2 stroke motor ?-----Post pictures of these carburetor parts.-----Easiest way for us to help you.

 

[werewolf]

ok heres what I have its the one on the red rag the others are what I found online

 

[oldboat1]

I believe your carb is messed up -- nozzle will not feed properly. Look for a replacement carb on Ebay, and do a rebuild (kit from the current carb(?).

 

[werewolf]

that's what im trying to confirm, is it supposed to have a small brass tube inside the larger one ? or is this some jerry rig someone did trying to make it run faster ? it has a nylon sleeve inside the large brass pullover tube and ive never seen that before

 

[racerone]

Many carburetors have that wee tube on the side of the nozzle.----It feeds fuel up for the idle circuit.----No it was not a misguided jury rig.

 

[oldboat1]

I would look for a brass tube (inner) like in the middle pic of the Ebay carb. Best guess is that a PO took out the inner brass tube, and messed up the outer tube in the process. Your call. Maybe that Ebay carb is priced right, if it would fit (whole or in part). JMO

 

[werewolf]

Racerone the brass pullover tube has a nylon sleeve inside of it,does not have the small brass tube inside it, from about 6 carbs I found same numbers as mine none have the small tube inside the larger one or the nylon sleeve , so I am going to take the nylon sleeve out and see if it will idle better, if it doesn't ill look for another carburetor .

 

[werewolf]

oh and the tach question , its my fluke meter which auto reads rpms

 

[Newyota]

ok heres what I have its the one on the red rag the others are what I found online

Shouldn't there be a gasket that slides down the tube tube or did you remove it for the pictures.

 

[F_R]

So the one on the red rag is yours, and the others are not----correct? Get rid of the other pictures, they are only confusing everybody.

As for the plastic tube inside the main nozzle, I've never seen such a thing, and yes I'm familiar with that carb. Who knows what some genius had in mind when he put it in there.

EDIT: "pullover tube" or "main nozzle". I think we are on the same page but different schoolbooks.

 

[werewolf]

yes there is a rubber gasket on the [main nozzle tube or pullover tube] and im going to take that nylon sleeve out of it because after seeing about 40 carburators last night that did not have it makes me believe it doesn't belong in this carburetor ,even the ones I looked at [rebuilt] on ebay did not have that nylon sleeve in them either, plus it blocks the tiny holes in the side of the [main nozzle tube] I didn't see a way to edit or remove the online pics of the other carbs .

 

[Faztbullet]

You main nozzle a has corroded hole and someone installed sleeve to try and correct it. You need a new carb body...

 

[F_R]

As I remember, the main nozzle is not removeable on that carb. I'll guess somebody tried to remove it and broke it off, then put the tube inside to patch it back together. Notice it is off-center in the picture. Good guess? Bad guess?

 

[racerone]

Many of these carburetors have that wee tube.----It is installed off center when it leaves the factory !

 

[werewolf]

ok this is what I did I took carburetor back off ,Removed that nylon sleeve double checked all the passages they were still clean, changed the float level from flush with carb body bottom to 1/16th above ,put it back on primed and started it up adjusted the idle mixture in just about a half turn, it was set at 1 and a half turns out so now its one full turn out, idles at 850 to 855 rpms now , did find a very small high spot on timing plate and when I turned idle bolt on outside I can get it to about 830 rpms and stays running. , so I, leaving as it is now, plan on finding another timing plate with a better roller ramp , thanks for the suggestions it does help to have options to consider .

 

[oldboat1]

Sounds like you are using a flusher. If so, try it in a barrel (i.e., plastic trashcan...) RPM would likely come down.

But I think you need to look for another carb body. Sorry.

 

[racerone]

Curiosity got to me.----Just took a look inside a 1973 model 25 HP carburetor.---It does not have the wee idle feed tube in it.

 

[oldboat1]

Have seen it, but don't remember what motor or how it was reassembled (eg., Does the wee tube center on assembly?) Also, I'm not sure whether the outer tube is a permanent feature. It might screw out with a big dog screwdriver.

 

[racerone]

The wee tube on carburetors that have them is always off to the side and STAYS that way when assembled.