Killie had won the league encounter 10 days previously, the 3-2 scoreline not being a fair reflection of their dominance.

But it was the Pars who began more positively this time and goalkeeper Alan Combe had to turn a Scott Thomson shot around the post.

McCunnie silenced the home fans with a terrific swerving shot from 25 yards to put the visitors ahead after just six minutes.

Young headed the second goal from Liam Horsted's left-wing cross two minutes later.

And the Ayrshire side's problems increased when Young shot past Combe from 15 yards.

Horsted then ran clear and shot just wide of Combe's left-hand post.

Kilmarnock brought on David Lilley for captain Gary Locke in the 37th minute as manager Jim Jefferies attempted to improve his defence.

Striker Naismith was brought into the action in the second half and it paid off when the 19-year-old set up Kris Boyd, who tapped into the empty net from five yards.

Boyd almost grabbed a second when his net-bound shot was blocked - then a Naismith shot flew wide with Colin Nish almost getting a touch.

But a quick break on the right by Horsted in the 64th minute gave Young his hat-trick and restored Dunfermline's three-goal lead.

Killie hit back, though, and Naismith was again the provider as his cross was turned into his own net by Wilson.

The home side went in search of a third goal to edge them nearer an amazing comeback.

They did get another through a Kris Boyd free-kick, but there were only seconds remaining and Dunfermline went through to the next round.

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