RPM Oscillating with New Carb - Snowblower Forum : Snow Blower Forums
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post #1 of 22 Old 10-26-2016, 04:56 PM Thread Starter
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RPM Oscillating with New Carb

Hello. I just installed a new carburetor on an older Snapper with a Tecumseh HS40-55552J and the engine RMP is now oscillating wildly. It mellows with the choke on high. What may be causing this? Here's a video... youtu(dot)be/EP2hgX1R1jY Any help would be appreciated. Thank you.
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post #2 of 22 Old 10-26-2016, 06:16 PM
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Well, your video link did not come through. What engine is on your machine?

Garage:
MTD....2 stage(modern 8.5 HP) not my favorite
Honda HS622 TA-B - acquired at an auction- nice machine for it's size.
Toro S-140- Picked it up on trash day... it runs, sort of.
Yamaha YS 240 TB "Ricky" latest Craigslist find- on the bench now.
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post #3 of 22 Old 10-26-2016, 06:24 PM Thread Starter
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@db9938
Thanks for the reply. You have to copy the website link: youtu(dot)be/EP2hgX1R1jY and paste in into your browser's Address bar, then replace the "(dot)" with a "." - I'm new to the forum so I can't actually insert a link. The engine is a Tecumseh HS40-55552J.
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post #4 of 22 Old 10-26-2016, 06:54 PM
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Smile Welcome Aboard!

Sounds too lean...


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post #5 of 22 Old 10-26-2016, 07:57 PM
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linked for you. I wish we could lighten up a bit on the newb restrictions.
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post #6 of 22 Old 10-26-2016, 08:04 PM
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I second the motion Mr. Chairman...

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Originally Posted by dbert View Post
linked for you. I wish we could lighten up a bit on the newb restrictions.
https://www.youtube.com/watch?v=EP2hgX1R1jY


I second the motion Mr. Chairman...
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post #7 of 22 Old 10-26-2016, 08:39 PM
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Surprising it runs much at all with full choke, all my small engines barely run on full choke.
Honda's, Tec's, and Kohler's.

Is the new carb a factory Tecumseh or chinese copy ?
Did it run the same with the old carb ?
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post #8 of 22 Old 10-27-2016, 12:00 AM Thread Starter
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Thanks dbert. Yeah, most forums are like this, need to have tenure before you can link.
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post #9 of 22 Old 10-27-2016, 12:08 AM Thread Starter
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Quote:
Originally Posted by russkat View Post
Surprising it runs much at all with full choke, all my small engines barely run on full choke.
Honda's, Tec's, and Kohler's.

Is the new carb a factory Tecumseh or chinese copy ?
Did it run the same with the old carb ?
I believe it's a Tecumseh. I got it off Amazon, said it was Tecumseh, but who knows these days. It didn't really run at all with the old carb. Which is why I got this one. At least it's running now, albeit poorly. So given that it runs (actually better) with the choke on, would that seem to indicate an air issue, like it's not getting enough if it? I've just never seen a carb oscillate like that. But then again, I'm a computer geek, not a petrol head.

If it is an air-related problem, is there an adjustment for that on this carb?
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post #10 of 22 Old 10-27-2016, 06:39 AM
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I have the same issues with my Craftsman 9 hp 2 stage snow thrower. It is 14 years old. The oscillation is so severe, it stalls. Sears repair said it was the carb. It still oscillates after they changed the carb twice. Strange thing is that when the engine is plowing snow, the oscillation stops! I am so frustrated by this that I am getting a new machine.
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