Don't worry about air in the bowl. It will come out when there is a fuel demand.
Weak spark can also cause the symptoms you describe. Check for a blue hot spark at each plug. Each wire should be making at least a 1/4" spark to ground at the plug end of the wire. Check the point gap and condition.
To check fuel availability to the carb, with the engine off, fuel valve open to normal run position, and plenty of fuel in the tank, get a clean glass container, remove the drain plug from the carb bowl, and catch the flow in the glass. It should have a full flow at first, then slow as the bowl empties, but it should still flow a stream, not slow to a drip or stop flowing.
Look at what was caught, if it's cloudy, that's water. If chunks of rust or dirt, it needs to come off and be rinsed out. Whatever is in the glass will also be in the carb. Once the tank is clean, the carb may need to be opened up and cleaned out. That can usually be done without a kit if careful with the gasket.
If there is little flow through the carb, start checking back to the tank for a restriction. There may be a screen in the fuel fitting at the carb.
Once the spark is right, the fuel is supplied and clean, the carb is clean, air cleaner serviced (including the wire mesh), it may be necessary to set the high speed jet.
To do so, get the engine up to operating temp, adjust the idle speed down to 400-500 RPM. Adjust the idle mixture screw (the small screw up top) for the best idle, then slightly rich.
Then adjust the main jet screw. To do so, idle the engine down, then suddenly open the throttle, listen for the response. If it hesitates, back the main screw out 1/2 turn, repeat the test. Keep repeating until the engine will take sudden throttle without hesitation. Continuous black smoke indicates too rich, turn it in some. The final goal is to have instant throttle response without hesitation, and just a single puff of black smoke.
Upload one or more videos to your post. Photo and video filesizes should be less than 5MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
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. [ About Us ]
Today's Featured Article - Bad Vibes - by Curtis Von Fange. One of the strangest ways to communicate with our tractor is to ask it how it feels. "Ask it how it feels," you say? Yup, ask it how it feels. Now, as with the other articles in this series one has to be able to hear what 'ole blue' is trying to say in response. The nice thing about our old iron friends is that they are usually quite consistent in their response, rather unlike some people I know who might change what they say due to the weather or other mitigating circumstances. But since t
... [Read Article]
Latest Ad:
1965 International Harvester McCormick Farmall cub tractor 2,500. Two owner tractor. My grandfather bought new in 1966, then we inherited it. Have all the paperwork original manual and all maintenance records. It starts and moves. Comes with underbelly mower, plough, and some other attachments.
[More Ads]
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.
