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 - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[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.
