Minor stumbling issue

[LEB Ben]

You want the carb set up where the highest vacuum reading comes in...so I wouldn't worry turning out any further if the reading didn't change. Out of curiousity, how many turns out was it? If it was more than 2, you still have problems elsewhere.

 

[smokey]

Good to hear it is getting better soon you may get it figured out.

 

[73F100Shortbed]

I hope so. It's been doing it for 4 years and I made the mistake of looking into it

 

[Alvin in AZ]

I'm probably not going to drive the truck until Sunday, but I will see then if it
makes a difference driving. I'm sure it will because it runs noticably better now.

I'm open to pulling the carb. back apart to re-drill the jets, but I'd like to see
some pictures of that so I do it the right way. I don't want to ruin it and have
to spend a bunch of money on a carb. The little stumble isn't worth forking out
$300 because it really isn't that bad.

My guess is what you did will really help the idle but won't help the stumble.

Which of the four holes is your "accelerator pushrod" in?
Have you looked in the carburetor and saw the two squirt-gun-like squirts?
And if so... or when you do... Are they the same in -every- way?

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I have my pushrod in the hole closest to the throttle shaft.
Mine will run pretty dangged good without the rod at all.

My need was for -smooth power- with the throttle open just a little while
climbing a steep spot on a dirt road or across sand without the jumpy surges
the pump creates. Fine for the city or paved roads but wasn't so good for
certain situations where smooth control was the most important thing.

First noticed the need for that on dune buggies and dirt bikes while up in the
mountains where the traction was spotty or had obstacles like rocks and tree
limbs.

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The trick is not to get carried away and make it too rich of course but the
"good enough" range is pretty wide IME.

It's really cool you already have the "good kind" of emulsion tubes, they are
tricky as anything to drill right and any vibration wallers the holes out bigger
than the tiny drill bit, making a large percentage change, right quick.

Reaming out the low speed (transfer) circuit jets is easy and not critical.
Got access to... ?
-a micrometer
-real- jet reamers
-welding tip cleaners
-.001" reading caliper

First two are best but the last two will work -good enough- for low speed
circuit jet enlarging. It's not so much a set number as making the holes like
~25% bigger than you find them and try it. Knowing what you started with
as a bench mark is what makes sense of any enlarging. As easy as that.

And, since those "down tubes" are easily replaced (or soldered-shut and just
start-over you aren't burning any bridges while experimenting.

Alvin in AZ

 

[73F100Shortbed]

The rod for the accelerator pump is in the 3rd hole which was recommended in the instructions and where it was before I took it apart. Maybe I should try moving it to the second hole? When I look in the carb. The gas squirts the same out of both holes and looks fine when it does.