What have I brought ?

Hi I'm a new bee Went to a show and saw one of these and thought gotta get one So
I have a Petter stationary petrol engine
Wico Type A 1057B Z Serial No E 553458
On the brass plaque It states Type A1 1501107 1.5 BHP 750RPM
Not started it yet as stood for a year or 3 :-( Looks like petrol not getting to the spark plug If I tip some petrol in the plug hole it pops once and that's it Spark looks ok What should I do next ?
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