New briggs question

[dshot59]

Like why is the crank smaller on this 4 hp then a 3 1/5. Not to mention that it only has 3 mounting holes. I figured I would just drill out the last one why not right ? What a pain in the can. Got it off a tiller inside was real clean so what the hey. It's a 2006

 

[Minimichael]

I'm thinking you could find others of the same hp with still different crank diameters. Depends on what the cranks were intended to drive, is my guess. Part nos. are a better reference point for different size engines. I wanna say I've seen those 3 hole mounts on tillers I've torn down.

 

[dshot59]

I put one of those 5/8 to 3/4 adapter sleeves on it. Drilled out the 4th bolt hole and off we go.