1973 Ariens 8hp Backfiring - Snowblower Forum : Snow Blower Forums
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post #1 of 5 Old 03-15-2017, 09:22 AM Thread Starter
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1973 Ariens 8hp Backfiring

So, I finally used my 73 Ariens 8hp yesterday and there was a problem with it backfiring, shooting flames, and surging. It worked great and when it was under load there was no popping or anything. I had to keep the speed a little under half way on the throttle or else it would rev really high on full or die with it at the lowest setting. It does have one of those E2 plugs from Lowes which does cross reference with the right Champion plug. So the problem has to be timing, air leak, or jetting (right)? I also do have the Carb with the adjustable jet. What makes the jet richer screwing it in or out? I have the manual for the engine too.
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post #2 of 5 Old 03-15-2017, 09:37 AM
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Hello and welcome to SBF scuzz. I would switch the spark plug and see how the engine runs. Some people report the E3 plugs do not function as they should. Did your machine run well, the same or not at all with the old Champion (j19LM) plug?

Screwing the mixture screws "in" leans the mixture and "out" richens the mixture. Adjust the screw in the side of the carb for best running at slow speed and the bowl (high speed) screw for best running at full throttle.

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post #3 of 5 Old 03-15-2017, 10:00 AM Thread Starter
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Thank you Grunt. I picked this up for $60 last week and changed out all oils and greased it all. I am going to pick up a regular Champ plug today since I need to do some clean up with it. Could it just be the jet needs to be screwed out some or am I just thinking its that easy? The person I bought it from said they had to remove carb, clean it, and replace the throttle spring to get it to run. They also put that pug in there and I doubt he used a rebuild kit for the carb.

Last edited by scuzz21; 03-15-2017 at 10:05 AM. Reason: Forgot inforamation
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post #4 of 5 Old 03-15-2017, 01:12 PM
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Go to eBay or Amazon and buy a new adjustable carb for $15, see if that solves your problem. My favorite store is the ROP shop.

1986 Ariens ST522, 5hp, 22"
1995 Murray Craftsman 10hp, 29" w. 12" impeller
A 1983 Real John Deere 10hp, 32" w. 12" impeller, 16" auger, 20" high front, cast iron gear box, chains
Noma 9hp, 27" w. 12" impeller
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Gravely Convertible, 12hp Kohler cast iron, 26" width, 600 lbs of cast iron & steel, 2 speed impeller, 4 ground speeds
Dynamark 8hp, 26", 12" impeller, for sale
Several other 5hp, 8hp, several 2 cycle, all for sale

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post #5 of 5 Old 03-15-2017, 04:02 PM
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I'd Check the Ignition Points.
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