Your problem is probably either the centrifugal clutch or the gear/reciprocating cutter mechanism. I've had a similar recent problem with mine, (sovereign 26cc hedge trimmer) and the problem is in the gear / reciprocating cutter mechanism. I will be stripping it down soon so I'll post results when I do.
Davie
August 2008
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 hedge trimmers.