I had issues with a 20 hp kohler command. One cylinder would foul plug like yours on the right. Other cylinder looked like your plug on left. I would switch plugs around and the good cylinder would clean carbon off plug while the bad cylinder would dirty it up again. Did the switch every 10 hours.
Boys at repair shop told me that could be either a bad head gasket or burnt valves. I did a compression test and leak down test. Both tests showed nothing wrong.
Then I bought new head gaskets, removed just the head on bad side, lapped in exhaust and intake valve. Problem solved. I didn't have to worry about valve adjustments. Kohler command has hydraulic valves.
My point, compression tested the bad cylinder. It was only a few pounds below the good side, yet under running conditions the bad side didn't have enough compression to run hot enough. Before valve job, I purchases an IR thermometer from HF and exhaust temps on bad side were 200 degrees less than the good side.
BTW, both my cylinders used same carb, which has no adjustments. Did you grind valves?
Upload one or more videos to your post. Photo filesizes should be less than 300K and Videos, less than 2MB. 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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
... [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.
