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8N Missing Under Load

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Chris in VA

06-09-2002 14:24:53




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Went out bushhogging this afternoon and after about 20 minutes the tractor ('47 8N, 6V, front dist)started missing under load. When I pushed the clutch in or stopped moving to reduce the load, the engine smoothed back out. When driving back to the house, the tractor ran fine on the level or downhill but started missing again on the hill up to the house. I know that I need to rebuild the governor (the response has really gotten slow and I am not getting the full engine range) but I checked the plug leads and they were all good. I suspect it may be a coil or distributor problem. I replaced the ignition switch recently, so I don't think that is it. Plug wires and wiring harness are new. Looking for suggestions of where to make a logical start before I tear into things again. I have the FO-4 manual and spare coil.
Thanks,
Chris in VA
Spotsylvania VA

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Fessman

06-09-2002 15:20:13




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 Re: 8N Missing Under Load in reply to Chris in VA, 06-09-2002 14:24:53  
Chris,

I had a similar problem a while back. Someone suggested I replace the bushings(in the distributor), which I did. It seemed to do the trick, and the bushings were slightly worn. The wear was in one spot, opposite where the cam contacted the points arm.

Fessman



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JP-man

06-09-2002 14:55:16




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 Re: 8N Missing Under Load in reply to Chris in VA, 06-09-2002 14:24:53  
Sounds like a) too much gunk in your sediment bowl, b) clogged fuel filter if equipped, or c) possible jet(s) clogged. A bad governor causes stalling most often, not missing...
When load increases, can you see the governor advance (pull the carb open more)? If so, go with the clogged jet. Easiest way I've found for that is, first count your fuel jet turns IN to full stop, as a gage for reinstallation. Then remove them, and remove the float bowl (leave the float & its jet intact for now). Get some carb cleaner spray with the thin tube; jet some of that into each open jet hole 'til it runs out of the float area. Use as much or as little as you think it needs. This should remove any varnish or dirt which may have accumulated over x-number of years since its last cleaning. Reinstall the jets to FULL IN, then count turns OUT to original settings or per your manual.
Sometimes a simple adjustment is all it takes. I'm a firm believer in "do the simplist task first", carb jet cleaning is near the top of the list. Oh, and while you've got the jets out, check them for gunk and wear as well.
Best o' luck! JP-man, No. Virginia

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