Flat spot with a Carter YF?
- Thread starter Asa
- Start date
Asa":4gpwe8eb said:
10/64 ths, buddy.
As AC/DC said https://www.youtube.com/watch?v=Y4fOJsogSDg
But wait, you aint gonna listen to no foreigner tellin ya what to do with the 10/64ths, are ya?.
http://www.carburetor-blog.com/carter-y ... arburetor/
Yes-sir-reee.
now http://www.carburetor-parts.com/YF-Chec ... p_600.html
YF Check Weight
Carter YF & YFA Check Ball & Check Weight Placement
1st of all we should know what the check ball & check weight is for. When you press on the gas to accelerate, the engine needs an extra spurt of gas to get you accelerated until the cruise circuit can catch up. This is where the accelerator pump circuit comes in play. Pressing the accelerator causes the accelerator pump diaphragm to move up forcing a small amount of fuel out through the main discharge. The force of this fuel forces the check ball and check weight, or in some cases just the check weight up, allowing fuel to flow through the main discharge. When gas isn't being pushed out the discharge, the check ball closes off the fuel so that vacuum from the intake doesn't siphon fuel through the main discharge.
Some Carter YF carburetors have a check ball with a check weight on top of it.
Namely,
Carter YF Carburetor 1971-74 Ford
1971-74 Ford 200, 240
See # 24 & 25 in the illustration below. Notice that the check weight is rectangular shaped. This check weight is nothing more than a weight. It probably weighs less than 1 gram, but that's OK. Too heavy and the check ball would not lift off the hole.
Carter YF Carburetor Check BallOther YF & YFA's might have just a check weight, but this check weight is tapered on the end and this taper acts the same as a check ball does. See #26 in the illustration.
Carter YF Check WeightCheck weight w/o check ball. There are 3 different lengths depending on the carburetor. Most use this one captioned here. After placing in the main discharge you should have 1/16 - 1/8" free space for the check weight to lift off the seat. You can grind the check weight down to fit.
Carter YF check weight
Check weight w/check ball.
Make sure you have about 1/16" - 1/8" of free space for the check ball to lift up.
If you need more, simply grind down the check weight to fit.
http://www.carburetor-parts.com/Carter- ... c_650.html
For any issues, read pages 1 and 2 at http://www.jeepforum.com/forum/f8/carte ... on-715326/
How you play 8, 46 and 47 ball with your YF governs how sucessfuly your Mustang will idle and transfer.
For carb parts like those balls and weights, check at your local NAPA parts house they used to carry them in stock. Good luck 
Asa":1ce7f12g said:
Compare, and replace. In the case of any confusion, use the replacement balls from the kit.
You don't need to find another size, Asa. Use the largest one with the square check weight in the Main Discharge.
Part 24/25 in Mikes Carbs.
Part 46/47 in the Jeep Forum
As long as it all fits without issues, like jamming into some thing when the parts are seated.
The big ball at 0.186, is 1/16" taller/ bigger than the small one, so Mikes Carbs asks you to check the free space, and grind it down the extra if its not clear above.
The key is making sure the ball seats, and rises. Good seating takes care of the richness problem everyone seams to complain about with this carb.
by pixel check, Scale factor to inches is to divide by 601.6
All Ollies balls were smaller than 0.186"
Ollies 10/64 ball (0.15625")is 94 pixels diameter (349-255)
Ollies 9/64 ball (0.140625")is 85 pixels diameter (434-349)
Ollies 8/64 ball (0.125")is 75 pixels diameter (509-434)
0.186 ball is near enough to 3/16, 0.1875.
Meantime, stick with the biggest ball you have. 3/16 = 12/64
As long as it seals.
Page 1 http://theamcforum.com/forum/70-hornet- ... 61082.html
Page 2 http://theamcforum.com/forum/70-hornet- ... 13889.html
The problem might be that the kit doesn't have the correct original ball size.
Main Discharge Check balls and weights
Main Discharge Check weight fell out at 5.30,
Main Discharge Check ball fell out at same time,
see it at 5.40 between the two blue napkins.
Mike found it 6.33, commented and showed it again at 7.20 on video 1 of 3 https://www.youtube.com/watch?v=TF1rMhCtjME
10.37 on video 2 of 3 https://www.youtube.com/watch?v=ru9qK9K09F4
9.01-9.47 on video 3 of 3 https://www.youtube.com/watch?v=BEWLhF7_T0Y
Main Discharge Check weight fell out at 5.30,
Main Discharge Check ball fell out at same time,
see it at 5.40 between the two blue napkins.
Mike found it 6.33, commented and showed it again at 7.20 on video 1 of 3 https://www.youtube.com/watch?v=TF1rMhCtjME
10.37 on video 2 of 3 https://www.youtube.com/watch?v=ru9qK9K09F4
9.01-9.47 on video 3 of 3 https://www.youtube.com/watch?v=BEWLhF7_T0Y
Too late, X. Found a local bearing supply place that had them.
I will say, though, I've yet to see a kit with the lifter seals in it. Roughly middle of the image?
http://www.carburetor-parts.com/YFA-Exp ... _1855.html
Asa":3mlcf8w5 said:
Too late, X. Found a local bearing supply place that had them.
Way to go. A 10/64 ball means you probably wont have to clearance the check weight to top housing space. Do check though. The sealing needs to be check with Mikes recomended carb spray, not DoubleYah Dee Forty.
Asa":3mlcf8w5 said:
Two kinds....but only if you ask....its on a need to know basis....
http://www.carburetor-parts.com/Carter- ... _2649.html
Part # G501 [highlight=red]Lifter Gasket[/highlight]
http://www.carburetor-parts.com/Carter- ... _1376.html
Part # G1072 [highlight=blue]Lifter Link Gasket[/highlight]
Both Thick and Thin have the same picture....and price!
Ok, carb is on, so time for a new thread.
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