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1957 861 Carb tuning issue

P

Polymerjohn

New User
The TSX-? carburetor I just rebuilt for my '57 861 does not have an idle speed adjustment screw. In the adjustment section it tells me to set it. WTH. Also my new seat and needle appear to be leaking because fuel came from the carb when I removed the air cleaner tube. I have rebuilt many carbs and thought this one would be cake. I must have messed up somewhere... (I think its a TSX-662 if I remember correctly. Brass plate was still on it)
Polymerjohn in OK
 
It should have an idle adjustment screw, but that just sets idle speed.
There is also an idle air adjustment. Important for low speed operation.

The new needles and seats can be temperamental, but it may
be just using a bit too much choke when trying to start if the gas
was found after trying to start it.
If not, make sure the gasket is under the seat, the surfaces are
clean and that the seat is in tight so it doesn't leak by under it.
 
Thanks for the input/feedback. I think I figured it out. All the different iterations of carbs out there are killing me. Below is a picture of the manuals and how they do not show my carburetor. The bottom left picture is what I think is the correct approach to my carb adjustments (picture of my carb). I just hope I can get the fuel tank flow to stop into the bowl without tearing it apart again. This carb has the Power Adjustment Needle in a different place than most. What I thought is the Power Adjustment Needle, is actually the Idle Adjustment Needle. Any help on tuning method would be helpful. I am going to start with page 101 in the service manual and go from there.
cvphoto39022.jpg
 

Set the main jet, "power jet" as you call it, at 2.5 turns out and forget it unless you are going to enter a pulling competition. Set the throttle at 500 RPMs and adjust the low speed for highest RPMs. If you were recently trying to start it with the choke closed and it didn't start in 5 seconds you should have gas sitting in the inlet.
 
The idle stop/idle speed adjustment screw is on the back side on
the linkage. Circled here with the spring on it.

mvphoto44037.jpg


Main adjustment is the brass T-handle shown here on the bottom.

mvphoto44038.jpg


mvphoto44039.jpg
 
Thank you everybody for the help. I moved away from my neighbor of 30 years that knew everything there was to know about tractors old and new. I miss you Roy. But thanks to the forum for posting some help.

John in OK
 
There's a sintered bronze plug at the bottom of the carb that's supposed to let fuel drain out if you flood it. Mine is plugged, and I suspect yours is too.
 
Question: Does it make sense to tune the engine, at least the idle setting, without the linkage connected. Then make the adjustment to the linkage that connect it to the carb linkage ball. If I connect my linkage now the way it is set, the linkage will hold the throttle plate off the stop, not good. Logic tells me to adjust the carb to run properly, then adjust the linkage to properly connect to the carburetor "ball".

What does the linkage in front of the carburetor do? It has some association with the alternator. Is it a governor of some type?

Polymerjohn in OK
cvphoto39264.jpg
 
(quoted from post at 09:20:22 10/18/19) Question: Does it make sense to tune the engine, at least the idle setting, without the linkage connected. Then make the adjustment to the linkage that connect it to the carb linkage ball. If I connect my linkage now the way it is set, the linkage will hold the throttle plate off the stop, not good. Logic tells me to adjust the carb to run properly, then adjust the linkage to properly connect to the carburetor "ball".

What does the linkage in front of the carburetor do? It has some association with the alternator. Is it a governor of some type?

Polymerjohn in OK
<img src="https://www.yesterdaystractors.com/cvphotos/cvphoto39264.jpg">
Click to expand...


That rod has no association with the alternator other than being on the same tractor. It is the connection between your throttle lever and the governor. The throttle lever sets the governor and the governor sets the throttle plate in the carb.
 
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