(800) 853-2651
SHOP NOW

JD 70 Carb Adjusting

super99

super99

Well-known Member
I admit that I'm not good with carb's, but I need some help. I got the 70 running, starts good after the motor overhaul. New points and condenser and plugs. It will only run decent with the choke pulled about 1/2 way out. The carb has 1 large adjusting screw in the bottom of the bowl and 2 small ones, one on each barrel. I think it's not getting enough fuel. Should I open the one on the bottom or the 2 little ones? Where do you set them to start from? I tried opening the small screws about 1/2 turn but didn't seem to help any. I drove it around a little with the choke pulled about 1/2 way, and when you push the throttle full ahead, it will make just a little black smoke and then clear up. It accelerates smoothly. Any suggestions? Chris
 
Rule of thumb is all the way in and back each one out 2 rounds and then start your adjusting from there. Hope this helps

Alan B
 
To adjust the idle correctly on the 2 barrel carburetor you have to ground out one plug wire and adjust the opposite side adjustment screw. Then stop the engine replace this wire, swap to the other side and do it the same way.
 
How did you correctly rebuilt the engine without having the service manuals? To know the clearances and torque values?
The carb needs to have every little passage cleaned. Dunking it in cleaner overnight and using the air compressor will not work.
Then set the float level, main and idle as per the operator manual.
1-800-522-7448
 
You must log in or register to reply here.

Similar threads

C
Ford LT11 Lawn Tractor
Replies
2
Views
203
CBenedict1024
C
A
8N Front Distributor Points
Replies
2
Views
106
Hobo,NC
Hobo,NC
A
Needing a little hydraulic schooling
Replies
13
Views
463
acalkins1957
A
J
Help adjusting throttle linkage on 1949 Ford 8N
Replies
1
Views
179
Janicholson
Janicholson
J
White 2-70 Carb icing up
2
Replies
29
Views
1K
scootergmc
S
Tractor Parts Tractor Manuals

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Copyright © 1997-2024 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy

Back
Top