Hey I just registered to correct this thread. Very old thread I know, but it came up in my searches many times, misleading me to order the wrong part number, and I don't want it to happen to anyone else. Nice forum anyway, so I might just stay in touch.

In short:
conrod 692419 has crank pin 1.50", piston pin 0.80"
conrod 494504 has crank pin 1.25", piston pin 0.80"

These 2 links confirm the crank pin diameters:
http://www.smallenginesuppliers.com/shop/html/pages/products/Briggs_Stratton_Connecting_Rods3293.html
https://www.smallenginesuppliers.com/shop/html/pages/products/Briggs_Stratton_Connecting_Rods3309.html


Before you order the part,  measure the crank pin diameter, because it might not be what the Briggs Stratton online part finder and your engine's code date tells you it should be. I found out the hard way that your engine might not conform.



Long version: So I have a series 28 OHV (model 287707 1272-E1 code 990913ZE). I know the engine is all original and never been repaired.
The Briggs & Stratton online part finder tells you that after Code Date 98063000 use conrod 692419 so that's what I ordered. I knew my crank and piston pin diameters were 1.25" and 0.80" and didn't think of checking that part # 692419 was the same.  I assumed, influenced by threads like this one, that 692419 was just an updated stronger version of 494504. It turned out it is not, and I wasted time and money exchanging the wrongly ordered part. And don't be discouraged by the parts finder telling you that conrod 494504 is only for L head models, it is also for OHV models if you happen to have the 1.25" crank pin.