ST724 Carb Identification Help - Snowblower Forum : Snow Blower Forums
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post #1 of 18 Old 01-25-2014, 03:06 PM Thread Starter
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ST724 Carb Identification Help

Hi Guys,

I am having the hardest time identifying my carb. I need a replacement, it's been rebuilt a handful of times and I need to make the plunge to new.

The machine is an ST724, 924048-019001. It's a 7hp Tec., likely an H70, but the first half of the motor number is completely rusted off. I have only the build date and line letter ID left on the motor number.

As I'm looking on the popular parts sites and amazon, I keep coming up with different parts numbers.

Does anyone have a specific part number for this machine with the correct choke mechanism?

Thanks all!
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post #2 of 18 Old 01-25-2014, 04:47 PM Thread Starter
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Edit, I found a number on the carb. It's located above the idle adjustment screw on the flat surface.

It is: 577 9J4

This is clearly not a tech.# Any ideas?

Thanks!
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post #3 of 18 Old 01-25-2014, 04:54 PM
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That is a Tecumseh carb series number. Unfortunately I have never figured out how to cross it over to a real number. I have heard it can be done.

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post #4 of 18 Old 01-25-2014, 05:16 PM Thread Starter
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Thanks Shryp,

Good to know that the # is a tech. #. Still puzzled though as to how to cross reference it?

I've found that my replacement carb should be #632371A. I'm thinking aftermarket on this one.

The beast will live! Eventually...
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post #5 of 18 Old 01-25-2014, 07:32 PM
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According to the Tecumseh cross reference sheet, the correct carb number with 577 stamped on it is 631920. From this link. I hope this helps.

Tecumseh Carburetor Manufacturing Numbers
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post #6 of 18 Old 01-25-2014, 07:50 PM
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would this one work



current machines
1-toro2450E-38419. 1-toro3000E-38435. 1-toro 3650E-38445
2-toro 521E-38052. 1-toro xl824pt 38086
1-.............,TORO XL 624ps..............
1-............, TORO XL 824ps..............
william
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post #7 of 18 Old 01-26-2014, 10:09 AM Thread Starter
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The choke lever is incorrect on that one. But thanks. I'm going to try and figure this one out today!

As an aside, is there an alternate location of the engine number on the block anywhere? Besides the one under my e-start plug?
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post #8 of 18 Old 01-26-2014, 11:16 AM
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Post a Photo(s) of the carb.
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post #9 of 18 Old 01-26-2014, 04:11 PM Thread Starter
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Here are photos!
My machine:

My rusted engine #:

On the unit:


Carb photos:








I can get more if need be.
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post #10 of 18 Old 01-26-2014, 04:35 PM
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You should run a wire brush or some sandpaper over the model number. I had one in much worse shape than that and I was able to get the engine numbers.

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