i had use coleman fuel that was over 10 year old with no problem in my single cyl. upshur. I did have problem with the rings.Then i switch it to an o-ring and i still had problem and ignition at first had home made points. Then i switch it to a s&s cdi system and it start to run right
Here a video of it running.
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http://www.youtube.com/watch?v=_ciPPCEPdH8
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Thanks for watching.