(Projekt @ Oct. 30 2006,09:06) Kerosene is similar in nature to Jet fuel and Diesel. It is combustible but not flammable like gasoline. The flashpoint for it is way, way, way, higher that even 101 race fuel. Your low compression briggs & stratton single would never come close compressing it enough to light the mixture specially if it is undiluted.
The only reason DinoAp managed to drive his vehicle was probably because there was enough gasoline to dilute it into something that could be burned albeit incompletely.
Due to the residual fuel in the lawn mower, that is if it didn't totally run out, you may be able to get it to fire only to start creating billowy clouds of white smoke and then stall out.