Bike was running OK,battery a little flat so put the charger on it ,on the boost mode and let it stand a while.However the boost fails to switch itself off.The engine now turns over without any problems but will not start.I,ve taken out the spark plugs,but they are not sparking,I,ve tried new spark plugs but still no spark.Can anyone make any sugestions please?(i,ve also checked all the fuses which found to be OK).thanks,GORDON.