HI . WONDER IF ANYBODY CAN HELP . BOUGHT A SYM JET 50 IN RED BULL COLOURS LAST MONTH WHICH HASNT RUN FOR  4 MONTHS AND PREVIOUS TO THAT PROB 3 YEARS .  SYPHONED OLD PETROL OUT AND PUT NEW IN , BOUGHT NEW BATTERY , TRIED STARTING AFTER A FEW KICKS IT RUN RUNS FOR ABOUT 5 SECONDS MAX AND THEN JUST RUNS OUT OF STEAM AND STOPS . BOUGHT NEW SPARK PLUG AND STILL THE SAME PROBLEM . NOW THE SPARK PLUGS IS DAMP SO FUEL IS GETTING THROUGH  BUT NOT FIRING UP  . ANY IDEAS, PLEASE ??