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DrAllis 
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Joined: 12 Sep 2009
Points: 21936
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 Posted: 08 Mar 2020 at 10:02pm |
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Bad coil in the magneto.
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WF owner
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Joined: 12 May 2013
Location: Bombay NY
Points: 5026
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Posted: 09 Mar 2020 at 8:29am |
It sounds to me like it's a problem that is related to something reaching a certain temperature or possibly a fuel restriction.
Have you checked fuel flow at the carburetor?
Doc is probably right. If you need a new coil, I usually get parts from Brillman.
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WDStudent
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Joined: 22 Feb 2020
Location: Indiana
Points: 16
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Posted: 09 Mar 2020 at 8:58am |
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Thank you Doc and WF. I'll get on it next weekend.
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DrAllis
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Posted: 09 Mar 2020 at 9:18am |
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I prefer to diagnose the problem before throwing new parts on it. If it's the coil, the spark will be weak, very weak or maybe not at all. If it restarts cold, pull off a plug wire while running and see how far it will jump a spark to the engine block/head. When it warms up enough to start to falter, recheck and see if the spark intensity is the same or weaker. If you haven't had the coil replaced, it's a fairly good bet it needs it as this is what they do when they get old.
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WDStudent
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Location: Indiana
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Posted: 10 Mar 2020 at 11:35am |
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Thanks. The mag was just rebuilt last month, which included a new coil and points. I can still check the spark as Doc suggested, but would appreciate any other ideas. Thanks.
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chaskaduo
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Joined: 26 Nov 2016
Location: Twin Cities
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Posted: 10 Mar 2020 at 2:33pm |
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Wasn't there a post about a collapsing hose or gas tank vent clog doing something like this to someone early last year?
Edited by chaskaduo - 10 Mar 2020 at 2:34pm
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1938 B, 79 Dynamark 11/36 6spd, 95 Weed-Eater 16hp, 2010 Bolens 14hp
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WF owner
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Joined: 12 May 2013
Location: Bombay NY
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Posted: 10 Mar 2020 at 8:36pm |
 WDStudent wrote:
Thanks. The mag was just rebuilt last month, which included a new coil and points. I can still check the spark as Doc suggested, but would appreciate any other ideas. Thanks. |
There are a lot of inferior Chinese made parts out there. Just because it's new, doesn't mean it's good. I went through a bunch of condensors on one of my (distributor) WD45 a couple years ago. One wouldn't even start the tractor.
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