D2 pony carb questions

If not available - brass stock and a Lathe?

The number 8 tube assembly is available, its 1 piece and HAS TO SLIGHTLY SEAT near where its labeled "13". Get a used USABLE bowl, whats the number on the round tag? As far as jets go.... if they don't come out, leave them.

ur number 12 tube is in the cast iron venturi part of the carb and needs to be there. Don't know if its avaiable.

Roberts carb in IA has most all the parts for that carb 712-262-5311. it is the same carb as the John Deere 2cyl diesels used on the v-4 pony motors
IE: the 720, 730

restore49 - I will if needed, but I would need more understanding of what the piece should be. Not enough of the tube left to model off of it.

ag-mike - The numbers on the tag are 5F3527 (cat's number, I believe) and 10368 (Zenith's). Seating at 13 makes sense. It still appears that fuel will flow both outside and inside the jet, unless the tolerances between the jet and surrounding tube are close enough to prevent that. The Z-219-A bulletin shows the (12) tube coming down to roughly flush with the bottom of the casting. I should be able to reproduce that. I think my current bowl is ok, other than needing cleaned.

oldfolks - I'll give Roberts a call tomorrow.

Thanks for help,
putsplut

restore49 - I will if needed, but I would need more understanding of what the piece should be. Not enough of the tube left to model off of it.

ag-mike - The numbers on the tag are 5F3527 (cat's number, I believe) and 10368 (Zenith's). Seating at 13 makes sense. It still appears that fuel will flow both outside and inside the jet, unless the tolerances between the jet and surrounding tube are close enough to prevent that. The Z-219-A bulletin shows the (12) tube coming down to roughly flush with the bottom of the casting. I should be able to reproduce that. I think my current bowl is ok, other than needing cleaned.

oldfolks - I'll give Roberts a call tomorrow.

Thanks for help,
putsplut

Roberts carb in IA has most all the parts for that carb 712-262-5311. it is the same carb as the John Deere 2cyl diesels used on the v-4 pony motors
IE: the 720, 730

[quote="olfolks"]Roberts carb in IA has most all the parts for that carb 712-262-5311. it is the same carb as the John Deere 2cyl diesels used on the v-4 pony motors
IE: the 720, 730[/quote]

No it's not. It's the same basic model, but there are a LOT of differences, if you have both on the bench in front of you...and I have.

ag-mike - all drilling was done on the cast-iron side, removing the jet (😎 and tube (no number) from the casting. The bowl came away clean, though only after a turn of the jet caused the jet to break at the hole near its head. I don't think I damaged the casting during drilling.

ronm - Is the casting Cat specific, and the bowl side at least partially common with other Zenith carbs? I believe the jet itself (😎 is common with the Deere side. Would the tube be as well?

Is the jet a close fit inside the tube? If so, are there really three holes in the center of the tube as the picture seems to indicate?

Thanks,
putsplut

I'll have to get down to the shop & dig them out, it has been a couple years since I tried to mix & match...I think the body casting is different, but not for sure.

Ok, there it is:
The carbs are basically mirror images, the castings are different, with throttle & choke on opposite sides, and not easily switched, the Cat has the mousetrap choke mechanism, JD doesn't.
The JD throat is 1", the Cat is 1-1/8". The spray bar tubes inside APPEAR to be the same, 6 holes on the underside, at an angle.
The idle jets appear the same, but the JD is a #10, Cat is a #12...
The float bowls & covers appear to be the same.
Hopefully, to lay to rest the myth that these carbs are "the same", even though they are both Zenith...

I THINK the gasket sets are the same, but don't quote me, I don't have a listing for the Cat.

Update: To add to the confusion, I looked at the 2 JD cabs I have after looking at the Robert's Carb catalog. One is stamped 20 on the bottom flange, it has the 1" bore, the other is stamped 18, & it has a 7/8" bore.