Read this thread which is current right now
Most likley culprit will be the brake module Timee cutter no start
#3
tagpop
To start: set brake, push control handles out, disengage the blades, put a bag of cement in the drivers seat. Does the engine turn ,now you can stand beside the mower and check (trouble shoot). If engine turns but does not start fuel cutoff selnoid is suspect, fuel filter, fuel lines.