Posted by Smokeys427 on September 18, 2012 at 10:04:31 from (63.246.224.178):
I have a '49 8N that's been converted to a 12 volt system. Ran great all season this year. But now when I'm out brush hogging (I live on about 5 acers) and under power it starts to backfire.
It does it one time and that's about it for a while and then all of a sudden it does it again. When it does it seems to lose a bit of power but then it starts to run fine again.
When it's cold it doesn't seem to do it at all. It does it after about 1/2 hour of brush hogging and usually again it's when I'm in fairly thicker grass and weeds.
It was tuned up at the beginning of the season (spring time) with new points, plugs, wires cap and rotor. I didn't have the time this year so I took it to a tractor shop that works mostly on 8-9 N's only. They do a great job on these machines and really know them well.
Now, this problem never started doing this until now. It never quits, just a loud backfire when it's warmed up and almost all the time when it's in deeper grass when it does it.
BTW, the coil is about a year old and so is the ignition key switch. We changed this all out when we converted it to a twelve volt system. Well, it had a twelve volt system but it was just a cobbled up system with bad wiring and such. Far from a professional job which again this tractor shop did this for me and WOW, did it run great until this backfiring started.
I've landed on bad times and currently fighting Parkinson's so the tractor shop is not a option this time.
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