I think its near the Mullhoand/Vinewood area near the houses, not sure though. Up the hill B.T.W.
Ignore what i said, according to G-Unleashed its says...
Mower
Info: Lawnmower
Parked Locations:*Dillimore, San Fierro *Hilltop Farm, San Fierro
Spawn Locations:None
Source: http://www.g-unleashed.com/index.php?cat=1...locations#mower