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Subject: Back Fire

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Paul in Mn    Posted 11-19-2017 at 03:29:37 [URL] [DELETE]        [Reply] [No Email]  
  • Back Fire
  • Help me on this question I have a miss and back fire at full throttle I have changed sparkplugs coil distributor cap points condenser cleaned the carb The only other things I have not done is change the in line fuel filter or flush out the fuel tank I will be back home in 2 weeks

    Dollar Bill    Posted 11-21-2017 at 06:39:59 [URL] [DELETE]        [Reply] [Email]  
  • Re: Back Fire
  • Many things could be going on:
    1. Distributor bushing may be bad which will let the points open oddly and cause a miss in the engine.
    2. Valves may need to be adjusted
    3. Bad plug or weak spark
    4. Does choking it hurt or help?

    AL CT    Posted 11-19-2017 at 11:31:01 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Back Fire
  • Doesn't matter what voltage or where the distributor is located. Two possible causes for a back fire. One, slightly off timing won't do it all the time. Big mistiming will cause it to back fire. Second reason, Sticky valve or one that does not close properly will do it all the time. Build up of raw fuel in the chamber will explode during the exhaust sequence.
    I had a Model A that back fired all the time. Changed the distributor, timed it many times all to no avail. Pulled the head, and sure enough one or two valves were sticking or not closing properly. As a precautionary measure, I replaced the valves and guides, ground in the valves and never again did it back fire.
    My humble opinion.

    clayton ingmire    Posted 11-19-2017 at 16:22:40 [URL] [DELETE]        [Reply] [Email]  
  • Re: Back Fire
  • have you taken a compression check if you have a low cylinder its like AL said possibly stuck exhaust valve just my two cents

    Farmer Dan    Posted 11-19-2017 at 10:23:19 [URL] [DELETE]        [Reply] [Email]  
  • Re: Back Fire
  • Need to know what tractor you are having trouble with? Could be a timing issue, have you looked at the distributor bushings for wear?

    Bruce (VA)    Posted 11-19-2017 at 08:40:14 [URL] [DELETE]        [Reply] [Email]  
  • Re: Back Fire
  • Model of tractor? Front or side distributor? 6v or 12v?

    Checked timing advance weights and bushing wear?

    Why do you have an in-line filter? You can add 6 of them and they won't fix a rusty tank. See tip $ 15. A new tank goes for about $160.

    Tim Daley(MI)    Posted 11-20-2017 at 07:47:35 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Back Fire
  • A short in wiring can also cause backfiring I found out years ago. I was mowing grass after work one Friday evening and it was getting dark. I wanted to finish up as I was going away for the weekend. When I pulled the light switch on, the engine would start backfiring. I shut switch off and it stopped, pulled switch on and it would do it again. The next weekend I got into the lighting system and discovered that one headlight had a hot wire worn thru to bare strands and was shorting out intermittently.

    Tim Daley(MI)

    Paul in Mn    Posted 11-19-2017 at 20:16:12 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Back Fire
  • 8n Front Distributor 12 volt

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