Why am I having trouble starting my gas hedge trimmer?
The fact that it sped up right before shutting off tells me it ran lean. My first inclination would be to an air leak, most likely at the intake manifold or exhaust manifold. Check the gaskets and the bolts to make sure they are intact/tight. Also I'd also check the gap on the spark plug. Does the compression feel the same when starting as it did before it quit running?