You don't mention what machine you are referring to, but most lawn tractors are DESIGNED to cut out if you reverse with the blades engaged - it's dangerous and usually a tractor has a particular procedure to be followed if there is no alternative - for instance on Craftsman tractors there is a position on the ignition switch that allows it.
phil_saunders(a)bigfoot.com
Phil Saunders
September 2012
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