A little help with a carb rebuild kit

SDE · Nov 2, 2014

The old choke shaft was froze up in the lower bowl housing. I used a torch to heat it up and removed it. It is now a sloppy loose fit with the old shaft. I used a drill bit to get the crap out and washed it out with a very good carb cleaner. The new shaft is still too tight. I can get it in but it does not move freely. About the only thing I can think to do is to reduce the shaft diameter. Am I missing something?
Thank you
SDE

R Geiger · Nov 2, 2014

I would not reduce the size of the shaft. You are missing something in the hole or have the wrong shaft.

Tall T · Nov 2, 2014

Are you certain you got any deposits out of the shaft bosses?
Sometimes the buildup looks like metal. Use a magnifying glass.

Are you certain that it is the right shaft for that carb?

If yes to those factors and unless you get better advice, I'd contemplate putting the shaft in without the butterfly and spinning the shaft with a drill to mate it in. I use Rapid Tap cutting fluid for such things as it breaks down surface tension.

Or you could use a drill to spin the shaft in emery cloth as you mentioned, so that whatever you take off, you do so evenly.

Tom N MS · Nov 3, 2014

I'd polish the shaft with fine emery cloth. Won't hurt a thing..Probably made in one of those places where it looks kinda like a shaft so it's o.k.

tractorguy2 · Nov 3, 2014

I would say the holes are still full of rust.

W_B · Nov 3, 2014

I had an issue with a throttle shaft being a little too tight, just used some fine emery cloth work it down a little. It's been fine since.

lha · Nov 3, 2014

I've used a cheap gun cleaning kit to clean out round surfaces. This particular kit was given to me from my son,probably so that I can clean the gun that I gave him for Christmas. The brass brushes are fairly gentle,and have a good handle for cleaning. I use W-D-40 for lube and to clean the bore. I use these for my other obsession:dirt bikes. lha

rustyfarmall · Nov 3, 2014

(quoted from post at 03:14:11 11/03/14) I'd polish the shaft with fine emery cloth. Won't hurt a thing..Probably made in one of those places where it looks kinda like a shaft so it's o.k.

Exactly!! I have encountered several throttle shafts that were too large. Only thing to do is reduce the diameter.

GB in MT. · Nov 3, 2014

(quoted from post at 22:52:08 11/02/14) The old choke shaft was froze up in the lower bowl housing. I used a torch to heat it up and removed it. It is now a sloppy loose fit with the old shaft. I used a drill bit to get the crap out and washed it out with a very good carb cleaner. The new shaft is still too tight. I can get it in but it does not move freely. About the only thing I can think to do is to reduce the shaft diameter. Am I missing something?
Thank you
SDE

b:70c5115116][i:70c5115116]

SDE;
STOP what yer doin' with a drill, before ya muck up and render the choke action useless!!!
I can tell you over the phone, what to do, to the choke rod, to make it work!!!!
If ya used a drill bit, over 3/16ths.....ya went way too big.

My guess is...the slot for the choke plate, is bent up and dragging on the shaft bore, at one end or both!!!!
If that is the case.....just a matter of making the shaft the SAME size around, full length of the shaft.

OR call me, and I'll walk ya through it, so you can use the choke when you need it!!!!

Gary
4066772526[/i:70c5115116][/b:70c5115116][b:70c5115116][i:70c5115116][/i:70c5115116][/b:70c5115116]

Tall T · Nov 3, 2014

" I used a drill bit to get the crap out."

I assumed you meant that you used a drill bit, but just BY HAND,
to clean out the bosses.

But if you actually power drilled them, then you may have gotten the two passages out of alignment with each other -- which would make the shaft "seem" tight.

T

Poppy545 · Nov 3, 2014

Those bosses should be cleaned with a hand reamer and a little cutting fluid. Measure the diameter of the shaft. The holes should be just a little bigger, 0.0005 - 0.002".

Poppy545 · Nov 3, 2014

Good idea!

Tall T · Nov 3, 2014

Good advice for sure . . .
but for me, I would first try fitting the new shaft and only clean out the boss if it was called for. Hard buildup can be to one's advantage.

Funny, your Username is the name of one of my cars, "Poppy".
I usually name the cars after the previous owner and in this case her name was Poppy.

SDE · Nov 3, 2014

BUT BUT BUT I only used my two feeble fingers to turn it. OK one of them was a thumb, but it was my right one. I will take it to work tomorrow and measure the shaft and then see if they have a reamer that is the correct size. I thought that by using heat to loose it, that I may have caused the size of the opening to get a little smaller. The carb cleaner is very good at stripping away any crap that is not supposed to be in there.
Thank you Everyone.
SDE

Tall T · Nov 3, 2014

Good man!
That's what I had assumed you meant in your first post.

But before I would ever risk enlarging the bores by reaming, I would just make sure they were clean and then doctor the shaft with fine emery for fit as suggested and polish it with 600 when you're done.

If you enlarge the bore when the shaft is at fault, then the next time around, if there is one, the correctly sized shaft will be too loose!

cheers,
T

Tom N MS · Nov 3, 2014

Probably just needs a milligillionth of an inch
removed---buff a little and ready to install..Seal
will never know the difference..

A little help with a carb rebuild kit

SDE

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R Geiger

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Tall T

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Tom N MS

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tractorguy2

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W_B

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lha

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rustyfarmall

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GB in MT.

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Tall T

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Poppy545

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Poppy545

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Tall T

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SDE

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Tall T

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Tom N MS

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