9K9418 is near the end of production, 1945 model.
Good on you for getting her going again.

So back to trying to get the pony motor going

how did it go. Not great, same as the previous 2 times a few coughs and that's it. I drilled all the lead plugs out of the bowl hand cleaned them with tip cleaning bits. Blew every passage I could find out with carb clean. Bowl is filling up fine just not making it to cylinders as plugs stay dry. New needle and seat as well as float. Set float horizontal.

So pulled it off again bought a gallon of Berryman chem dip and will soak it over the weekend

Any other suggestions would be great

Thanks

Hi T M,
sounds like you are not getting gas past the inlet elbow of the carb.
Have you checked for good continuous flow in the fuel line from the tank to the carb elbow--you can get flow that is just what is in the line to fool you into thinking there is Continuous flow.
Make sure you remove the elbow too as I have found crud in there that would test OK with air but not flow fuel thru.

Also check the drilling the middle of the needle and mixture hole in the side of the hollow main jet needle is clear.

The initial Main Jet Needle setting is 3/4 of a turn open from gently closed.
The initial Idle Jet Needle is 1/2 of a turn open from gently closed.

Make sure the threads on the Jets are clean and do actually let you close the jet for accurate pre-setting.
After the engine is started and warmed up adjust the jets open to give black smoke and then close them down to give smooth running and best power.

Something else I have encountered is if the carby bowl is filling with gas then maybe the gas you are using is stale. Todays gas has a very short usage life.

Mates Diesel Fifty pony, had great compression and would fire but not run on any gas that was over a day old.
My RD6 pony was tired but would start and run fine on old gas--the only thing consistent about ponies is the inconsistency.
Hope this helps.
Cheers,
Eddie B.

Eddie thanks for your thoughts.

The first time I took it apart that needle with the tiny orrifice was plugged but that was it the rest weren't bad. The bowl itself is filling not sure on speed of filling. Will take drain out of bowl and test that when I put it back together. You are right our gas today Is horrible the gas that's in it I put in on Thursday.

Two thoughts I had is the gasket between the Venturi body is not perfect as I reused that. The other is what I assume is a vent that looks like a big shower head coming off a 90 off the bowl is pretty hard to blow through I took it apart and cleaned it but the wool still seemed pretty restrictive. I will set the jets the way you recommended them and give it a try.

Thanks again

Jamie

The gasket between the bowl and the venturi/throttle body should have a bull's eye appearance. Sometimes the center ring goes missing and the carb will not function without it.

Note that the idle mixture screw actually controls the air mixing with a set amount of gasoline, so open it up to lean the idle mixture. The high speed mixture works directly on those, so open it to richen the mixture.

Thanks

My gasket has the Bulls eye

My only thought is that my bowl vent is too restrictive it is wool and very hard to blow through even after cleaning. I was thinking of replacing it with a piece of cotton.

I currently have the parts soaking in a gallon of berrymans chem dip for the weekend and will see how it goes Monday.

Thanks

Jamie

Other versions of the TU4C did away with that "shower head/overflow" bowl vent.
Check and see if you have the internal vent.

My son had a d2 that the pony gas line would let the pony idle. If u tried to throttle up it would die. When we disconnected the line at the carb gas would come out like nothing was wrong. Finally after a lot of fxxxing around by chance i stuck a wire into the line between the shut off and tank. TONS of rust sediment came out. After taking it off to clean it proper, had to change it because it had rust pinholes in it. After new line the thing ran fine. I had a deisel fuel line to the lp pump practically fill with rust sediment to on a d4 i had too. Don't believe u got a full open fuel line till u run a sized wire brush through it. Over the years these things rust. good luck with ur project.

Mine does not have that circuit

Could the wool or felt that's hard to blow through even after cleaning be enough to not allow the motor to pull the fuel? I think it might. I was going to replace the felt or wool with cotton or a scotchbrite pad.

I will check the metal fill line

When I first looked at it there was questionable fuel in it so I drained all that out and it didn't take that long to drain the gallon or so from the tank. I did add a clear inline filter to keep an eye on things.

I hope the vent is all that's messing me up if not I'm out of ideas

Thank you all for your help and suggestions.