Slight misfire (pop) - Snowblower Forum : Snow Blower Forums
 
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post #1 of 5 Old 01-10-2018, 05:49 PM Thread Starter
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Slight misfire (pop)

So I did some serious work on this old Ariens ST724 with a 7 hp Tecumseh Snow King.

  • Drained the fuel and cleaned the tank
  • New fuel shut off
  • All new fuel and primer bulb hoses
  • New spark plug
  • New carburetor
  • Changed the oil, twice !

After quite a bit of fiddling with the governor and the main and low speed jets I have it running pretty good. (Boy, is that high speed jet adjustment touchy !)

The only problem it has is that there is an occasional miss (pop) at all speeds. I don't think that it is a lean miss because adding fuel to the main jet does not help. It also smells like it is running rich.


Any tips to get rid of that miss ?
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post #2 of 5 Old 01-10-2018, 06:41 PM
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could need some work on the exhaust valve ?

24 " 1967? Ariens Sno thro
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post #3 of 5 Old 01-11-2018, 11:16 PM Thread Starter
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could need some work on the exhaust valve ?
That will likely have to wait until spring. Pull the head and check the valve lash. This engine has had a rough life with very little TLC.
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post #4 of 5 Old 01-12-2018, 03:03 PM
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A bad muffler might sound like a skip.

How does it sound blowing snow. With me as long as it idles and runs right when it's blowing she's OK.

Bob
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post #5 of 5 Old 01-12-2018, 04:02 PM
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Quote:
Originally Posted by theoldwizard1 View Post
That will likely have to wait until spring. Pull the head and check the valve lash. This engine has had a rough life with very little TLC.
You should be able to check valve clearance without pulling the head off. If it turns out you need to do a valve job, then the head needs to come off. I agree with the idea of waiting till spring. Something about cold weather that makes a skinned knuckle hurt 5 times more than when its warm

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