Posted by gears on September 05, 2018 at 18:03:35 from (69.81.131.202):
So I inherited an old Simplicity from a friend (1973 Soveriegn 3614H) and it's powered by a big old cast iron B&S 16hp horizontal shaft single cylinder. The stupid thing runs fine for about 28 minutes then sputters and you can only keep it running if you throttle down to 1/4 or less. Park it for the day and next time you come out it runs fine......for about 28 minutes!
Every time I work on it, it acts like it's fixed, for about 28 minutes.
1. We thought it was the coil. Have to pull the motor to get the airshroud off to change the coil so I bypassed it and have the factory points firing a battery ignition. Ran great for 28 minutes.
Dies off and still has nice blue spark when it dies.
2. Carb had a cobbled gasket, rebuilt it with new oem parts. 28 minutes.
3. Removed the PO's inline fuel filter thinking it was plugging up. 28 minutes.
5. It's got to be the valves, they heat up, lash is too tight, after running long enough to come up to temp it has to be held open.... Nope, pulled the head anyhow to decarbon. Black and sooty but no huge deposits, valves seal, cyl looks good-no ridge / scoring, nice and clean, no bent valve. 28 minutes.......
What am I missing?! Do I need to yank the sucker and drop a magnetron coil into it? Thought I'd read that the magnets on the flywheel need re-polarized opposite for magnetron compared to the points ignition.
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: Oil, Oil Filter and Air Breather - by Curtis Von Fange. In the preceding articles we discussed some of the various aspects of doing a comprehensive tune up. Hopefully some light was shed on why we do or don't do certain things pertaining to inspections and order of events when doing a tune up. Perhaps some useful reasons were given for why parts fail and what to do about preventing part failure in the future. All these tips will help us think and reason out a problem in order to make our tune up last and, hopefully, keep us from spending extra mone
... [Read Article]
Latest Ad:
1 SD Gibson, 1 D Model needs rear end assembled and installed, 1 D Model needs minor repairs, extra parts
[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.
