Spark plug covered in black soot. Have to replace with a new spark plug every time to start.

MAX, December 2004

If it is a primer type carb then the diaphragm between the carb and tank would cause this problem if it still runs the same without the air filter fitted

peter, January 2005

It is your air filter. Take it off and wash it out with soap and water. Dry and put some engine oil on it and squeeze it into the filter. This helps catch the dust trying to get through the filter which could cause engine damage. If it is degraded, replace with a new one. The engine requires the correct air/fuel mixture to run properly. Those engines also are noted for dirt and water getting into the gas tank because of the gas cap venting. If this happens you have to remove the tank and flush it out.
I hope this is of some help.

John at Rona, January 2005

too mutch petrol too rich mix take off air filter may be blocked spark plug gap ajust if this does not cure

eamon, January 2005