Originally Posted by Ridin' Green
The 910 is actually 20.5 HP. The 22 number was under the old rating system. The MOD isn't an option on a 910. You'd need to step up to the 920 to get a MOD, and only the 48" MOD is available on the 920. I believe the 910 with the 48" deck is fine for normal cutting, but it will starrt to lack power if the grass is wet and or thick and there are any hills involved at all.
A lot of guys on here have bought them and replaced the throttle plate with one from a 920 which is the only true difference between those two engines. It's about a $40 part and an hour or so of your time to do. There's a thread in the mechanic & repair forum if you do a search on it there.
A 20.5 hp engine on a 48" deck reg mowing will not lack power - I run that same combo now.
7x14 Stealth SE Enclosed with 48" side ramp
08 Toro Z400 48" deck, 21HP Kaw with EZ Vac twin bag
09 Exmark Turf Tracer HP 36"
21" Toro SR4 Super Recycler
Stihl KM90 Kombi w/ straight shaft trimmer & tiller heads
Husqvarna 125B Blower
Turfco XT5 Aerator
Turfco LS-22 Overseeder
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