JD 420 UPDATE

grandpa Love · Oct 28, 2021

Got it all back together and fired it up. Wasn't running exactly right. Took a break and went grocery shopping. Got back and tinkered around a bit. Decided to pull the carb off and have a look. Sure enough one tiny hole was plugged up. Tried everything to get it cleaned out, no go. Realized we had a parts carb with the same bottom half. Swapped it, stuck it on tractor and we running like a Deere! Was out driving it around the yard in the cold, dark, rain! Lol.

How do you get that brass tube out?

This 'screw' won't budge...

Janicholson · Oct 28, 2021

Unless it is broken off, or bent beyond use, leave it alone. It is the main jet and metering tube. They are usually easy o clean and likely to become unusable if determined to be removed. Jim

Royse · Oct 28, 2021

Your last picture is how you get that nozzle out.
It appears that someone has tried and damage the slots.
Try boiling it in water and letting it cool a few times.
Then use a gunsmithing hollow ground screwdriver to get it out.

The problem with that design is that people turn that half upside
down on their workbench and damage the top end of the nozzle.
Then they are not round anymore and they have to be replaced.
Luckily, they come in the decent rebuild kits.

JimB2 · Oct 28, 2021

Good news, I spend many hours operating a 420U between 1956 and 1969.

rustred · Oct 28, 2021

thought ur wife was the cab specialist. lol. that thing is a mess where is your gunk carb cleaner ? throw in in over night then you will have results.

grandpa Love · Oct 28, 2021

That's a 3rd bottom half.... Hasn't been messed with. Some how I've ended up 10-15 halves of carbs,they keep finding me Will soak it if we need it

SVcummins · Oct 28, 2021

Looks like someone left corn squeezins in it when it got parked last . Wish you were closer I need that engine for my 420c

Johnnypopper · Oct 28, 2021

Put Put Put. Its a wonderful sound.

420 Deere · Oct 28, 2021

I have a good block with cam/lifters. late model with oil fill on side.

matthies · Oct 29, 2021

Soak it in vinegar for an afternoon, and see how it is. Don't leave it in there overnight!

Mark-Ia · Oct 29, 2021

Heat, and let it cool. Usually come out pretty easy then.

Royse · Oct 29, 2021

This one had the same problem as yours. Battered ears, wouldn't
turn out. Boiled it for heat, let it cool a couple of times, then used
a hollow ground screwdriver and a little tapping on the handle from
a small hammer and it turned right out. This was today.

grandpa Love · Oct 29, 2021

Royse, after we get that out then that
small hole will be easy to clean? Soaked
it for several days in a bucket of carb
soak. Tried torch tip cleaners and small
drill bits ... Keep getting stuff out of
it but can't spray cleaner or air
through it.

Royse · Oct 29, 2021

That nozzle comes in the kits. You can just screw the new one in.
That eliminates any bends or damage to the existing one too.
But if you need to clean it, it would be easier to clean.

560Dennis · Oct 29, 2021

Most likely its a #80( .04) Drill for the idle circuit. Use a pin vise and hand rotate to clean it out the hard crusty crude. Run like a champ again

Az peapicker · Oct 30, 2021

Good Morning Kevin
I save the old brake cables from lawnmowers , use 1 strand of it to clean the orfices of carbs, Azpeapicker John 480 250 3864

JD 420 UPDATE

grandpa Love

Well-known Member

Janicholson

Well-known Member

Royse

Well-known Member

JimB2

Well-known Member

rustred

Well-known Member

grandpa Love

Well-known Member

SVcummins

Well-known Member

Johnnypopper

Member

420 Deere

New User

matthies

Well-known Member

Mark-Ia

Well-known Member

Royse

Well-known Member

grandpa Love

Well-known Member

Royse

Well-known Member

560Dennis

Well-known Member

Az peapicker

Member

Similar threads