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Help with B12 SG Belt

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Okay, I picked up a B12 earlier this summer. I noticed the SG belt was a 1/2 by 38 and it was to wide, wouldn't fit in the motor belt groove. I went to the manual and looked and manual said 1/2 by 38 belt. Looked at my Big Ten and B10 and saw a 3/8 by 38 belt on the SG. I went to the motor on the B12 and al I could read on the motor shroud was 300421 1 the rest was covered under debris and the frame. I tried a 3/8x38 on the B12 and it was to short. [IMG]http://img.photobucket.com/albums/v374/55chevy/b12c.jpg[/IMG] Any thoughts on what motor I have or the correct 3/8x ?? SG Belt? Is a 12hp SG belt the same size as a 10hp SG Belt? Help as I don't have a mower until I get the B12 back up an running. Thanks, Chris

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