to mess with it....or not to mess with it...that is the question....

I'd fix that Carb. You will be happy Hillbilly. It's not hard to do. You will be so much happier and easier to get along with.

Hi, Hillbilly.
If you decide to go the 'fickzit' route, this page may be helpful, depending on what carb you have.

http://www.acmoc.org/bb/showthread.php?21998-Starting-engine-carburetor-adjustment-(Late-modle-D-2-Zenith-TU4C-carb)

If not, I'd be surprised if there isn't somebody who has the info here.

Just my 0.02.

he ain't got that carb by stating "...and my carb doesn't have that 90' bellcrank in it....:usa2: Hillbilly do you know anyone with ultrasonic cleaner, i think thats whats it called. guys on the garage journal swear by it cleaning tiny passages. i ain't got no experience with it. i believe if it were me i'd use it 3/4 choked rather than pull those pia's off. good luck with ur project.:usa2:

I just did my D2 carb a week ago and did not remove the carb from the pilot motor, if you remove the pilot governor it gives you good access to that cross passage under the carb bowl which I gently drilled out the solder plug and then explored the passage which on this D2 felt pretty clean, obviously I used plenty of carb cleaner and compressed air before bolting it all back together with a .177 air rifle slug punched back into the hole covered in some Loctite 515 sealant.

I'm not suggesting this is the proper way to do it but if you are time poor like so many then this quick fix can possibly save you a days work removing the firewall, magneto and carb then refitting it all and trying to time the magneto right, if it doesn't work all you have lost is the 5 minutes removing the governor, which you should be doing anyway to service it because after 50 or 60 years you can be confident the governors on these old Cats have never been serviced and are dry inside and need re-lubing with some ATF, the new gaskets are available ex Cat or can be made.
Mike

I just did my D2 carb a week ago and did not remove the carb from the pilot motor, if you remove the pilot governor it gives you good access to that cross passage under the carb bowl which I gently drilled out the solder plug and then explored the passage which on this D2 felt pretty clean, obviously I used plenty of carb cleaner and compressed air before bolting it all back together with a .177 air rifle slug punched back into the hole covered in some Loctite 515 sealant.

I'm not suggesting this is the proper way to do it but if you are time poor like so many then this quick fix can possibly save you a days work removing the firewall, magneto and carb then refitting it all and trying to time the magneto right, if it doesn't work all you have lost is the 5 minutes removing the governor, which you should be doing anyway to service it because after 50 or 60 years you can be confident the governors on these old Cats have never been serviced and are dry inside and need re-lubing with some ATF, the new gaskets are available ex Cat or can be made.
Mike

he ain't got that carb by stating "...and my carb doesn't have that 90' bellcrank in it....:usa2: Hillbilly do you know anyone with ultrasonic cleaner, i think thats whats it called. guys on the garage journal swear by it cleaning tiny passages. i ain't got no experience with it. i believe if it were me i'd use it 3/4 choked rather than pull those pia's off. good luck with ur project.:usa2:

[quote="Mike Meyer"]I just did my D2 carb a week ago and did not remove the carb from the pilot motor, if you remove the pilot governor it gives you good access to that cross passage under the carb bowl which I gently drilled out the solder plug and then explored the passage which on this D2 felt pretty clean, obviously I used plenty of carb cleaner and compressed air before bolting it all back together with a .177 air rifle slug punched back into the hole covered in some Loctite 515 sealant.

I'm not suggesting this is the proper way to do it but if you are time poor like so many then this quick fix can possibly save you a days work removing the firewall, magneto and carb then refitting it all and trying to time the magneto right, if it doesn't work all you have lost is the 5 minutes removing the governor, which you should be doing anyway to service it because after 50 or 60 years you can be confident the governors on these old Cats have never been serviced and are dry inside and need re-lubing with some ATF, the new gaskets are available ex Cat or can be made.
Mike[/quote]

my adjustment screw is on top.....I little different than your pic.but not by much...ill.post some pics tomorrow in the daylight....

Well done on getting her running, that is a nice feeling for sure, I have 5 pilot motors hillbilly, a couple have the later crank style main jet adjuster, the others have your vertical screw type, the cross passage on the carbs is the same.

my next question.....what is a good starting point for the adjusting needles....if I remember right....I gave them 1.5 turns from seat....is this about right?