Got a John Deere G110, 54" 3-blade deck with a PowerFlo bagger, & a Kohler CV730S-0020 v-twin engine. Decided to go with a new engine rather than rebuild - don't have the time or space, and don't need the aggravation of carting the block to the machine shop an hour drive round trip.
After lots of research, it looks like the Briggs & Stratton 44Q777-3137-G5 seems to be the one that fits. I need a 1" x 3-5/32" shaft (aka 1" x 80mm ... or 25.375mm x 80mm) with a .25" (6mm) keyway, drilled and tapped 7/16 -20, 1.5" deep. PTO face is 10" with four .36" (9mm) through holes.
I would have preferred a Honda or Kawasaki, but nothing matched up as closely as the Briggs. Another Kohler is out of the question - 180 hours on this one and it's burning oil.
Besides, they're all stupid expensive.
Found a Briggs 44Q777-3137-G5 for decent money - under $700 shipped, brand new. On the fence ..... should I pull the trigger, or keep dumping $4 a quart oil in this thing every time I mow? These tractors are for sale used from $2,500 - $3,500 with MANY more hours than I've got, so a new engine would certainly be cheaper than finding another tractor. These are fairly rare to start with (only made '04 & '05), so finding a good parts one is next to impossible.
I would really like a zero turn, as I really have no use for a tractor - my Polaris ATV is my workhorse. If anyone wants to trade (I know ... but had to ask!) for one that needs a little work, shoot me a PM.
Also let me know if that Briggs engine is a POS!
Not too much info on it out there on reliability.