Allis 190 Holley carb question

Someone brought me a holley from a 190. I've never been into one before. I want to soak it in cleaner over night but it has internals like I haven't been around. There looks like a diaphragm under a plate that's held on with three screws. This diaphragm has a tear in it. Also how do you get the spring out from under that plate. The spring sits in the upper housing with some kind of small round brass plate or plug holding it in but I don't want to wreck anything by just prying on parts. Also this carb is so full of gunk I had to use a needle nose pliers to pull the float needle out of the seat, a first for me! Any advise as to taking it apart? It looks like I may need a kit. Are there any good quality non foreign kits available for this?

The owner doesn't want to change it over to the Bendix or Zeinith or what ever the other carbs were.

PS I looked at a parts breakdown and the brass plate or plug I mentioned looks like it is called a "pump piston". The way that float needle came out I doubt it will be easy to remove that piston.

Thank you for any help,
Lonn

Those carburetors are designed much like an automotive carburetor. That is what makes tractor mechanics hate them. The diaphragm is a power valve. The piston is an accelerator pump. Everything in them MUST work properly or the tractor will be a be-atch to drive, althoug a sweet machine when right. I like them for my pulling engines. Research then read and understand everything you can find out about them. The adjustability of them makes them far superior to normal tractor carburetors.

Try Mike's Carburetor Parts 888-689-9758 some Ford Tractors Used Holley Carbs also

Have had very good luck with Treadwell CarbCo.

OK I can't see how I could get by without the diaphragm. It's there for a reason though it ran with this bad one. Now the owner wants a rebuilt carburetor to replace his Holley. He found one online through Allstates Ag Parts. Are these worth putting on? He's pretty insistent that this is what he wants but I'd like to know if anyone here has any experience with these rebuilt carbs from Allstates Ag. Also, if they can rebuild them then why can't I?

The Holley web parts page shows ONE diaphragm. It says 30mm and that's all. It doesn't say which carbs it is made for. Is it one size fits all? I dunno.

If you can't understand the Holley tractor carburetor, it is best to leave it to someone that does. In that scenario it is just best to replace it with something simple that you can understand. These are obsolete only because they were not accepted by tractor mechanics. Parts are for the most part NLA. there are some places that still have parts if you know how to find them.