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Subject: 8n backfire

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Mike lavigne    Posted 03-10-2020 at 14:44:27 [URL] [DELETE]        [Reply] [Email]  
  • 8n backfire
  • I have a 1949 8n over the winter I tuned it completely I took it out to scrape the road and it works great going downhill but going uphill it seems to have a little less power and backfires sometimes. I would appreciate any ideas on what this might be.

    Mike lavigne    Posted 03-11-2020 at 15:12:17 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n backfire
  • Thanks for all the help it it was the timing like you said.

    HCookle    Posted 03-10-2020 at 18:54:48 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n backfire
  • In addition to what others have said, a lean mixture can cause a backfire. Also an error in timing.

    Bruce (VA)    Posted 03-10-2020 at 17:35:17 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n backfire
  • check the simple stuff first as John said: firing order.

    " I tuned it completely"

    What did you set the points at?

    Did you set the timing after you set the points?

    John in Mich    Posted 03-10-2020 at 16:03:27 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n backfire
  • Check #3 and #4 sparkplug wires. They often get reversed. Firing order is 1-2-4-3.

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