the Toro and Fms have Ceramic rear bearings..the FMS has a Filled crank..and the specs on the engine (FMS) were from Jim Hottingers suggestions( i think his partner /chris had imput as well) i have had both and for truggy if you want just the baddest around i think this the FMS is the choice...it is on here alot and recommended for truggy..but Adam drake likes the Plus 4...it can be preference too....but it will go 9-10 minutes .