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Does anyone know the compatibility of briggs and stratton crankshafts when it comes to quantums? Looking to swap a 7/8 crank to 25mm.

12H802-3129-B1 7/8 (2002)
126T02-0299-B1 25mm (2010)

Download the IPL's and look at the piston numbers
AFAIK the only difference is the crank journal diameters .
I gather you have one that siezed in the crankcases .

I don't access to the line drawing of the 590807 crankshaft but all the other used in this series all have the same journals diameters. The only differences I see is the PTO ends are different.

This the line drawing for basic crankshaft in this series along with the 691451 PTO end used in the 12H802. As said I can't find the line drawing for the 590807 used in the 126T

You should be able to compare the specs from this drawing to the 590807 to see if they have the same journals.

Edit: This what suffix letters on the 691451 means.