Check fo loose connections on the battery, the starter solenoid, the starter motor itself, and the battery earth cable. Also the engine earth cable - if fitted. If they are all tight (and the battery is charged), possible duff starter solenoid.
phil_saunders(a)bigfoot.com
Phil Saunders
May 2011
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix lawn mowers.