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.
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