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post #1 of 5 Old 01-28-2019, 09:50 PM Thread Starter
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Surging on Idle and Load

I have a Yardman model number 31ae5klf701 with a Tecumseh lh358sa 159502z engine. I have replaced the carburetor with a new adjustable carburetor https://www.amazon.com/dp/B01D40658I..._-77tCbV52SY3B and brand new gaskets. Also replaced the fuel line but still having noticable surging both under load and idle. Any ideas why?
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post #2 of 5 Old 01-28-2019, 09:55 PM
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Garage
Make sure you have no water in your gas tank and gas can then adjust the governor.

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post #3 of 5 Old 01-28-2019, 11:38 PM
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Bad gas can do that. You might also have a defective gas cap that isn't venting properly. Does it still surge if you run it with the gas cap still on but unscrewed so it isn't airtight? If so, the culprit is the gas cap. Just buy a new one. Or you can drill a small hole into the defective one for now.
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post #4 of 5 Old 01-29-2019, 01:37 AM
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but did u adjust the high and low speed jets?
donyboy has a vid on that

Bought a dead but now fixed 1980ish craftsman II 10/28....ITS ONE HEAVY BEAST

MY VIDS ON FIXIN HER UP

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post #5 of 5 Old 01-29-2019, 05:57 AM Thread Starter
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I only use TruFuel and I emptied out the gas tank. It surges with the gas cap on or off.
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