HELP. MY WEE DISCO2 BABY,TD5 XS HAS A WE STARTING PROB,STRUGGLES TO FIRE UP,ALTHOUGH ENGINE TURNING.ACCELERATER FEELS SOFT LIKE NO PRESSURE THERE,PUMP IT A FEW TIMES SHE FIRE UP AND PEDAL BECOMES STIFFER. ANY IDEAS FOLKS.ONCE STARTED SHE RUNS FINE,SWITCH HER OFF AND LEAVE HER A WHILE,BACK TO SQUARE 1 AGAIN.