Petrol Engine Machinery
A. Requiring the Choke to stay on to run is usually a fuel delivery problem and you should clean or replace the Air Filter and Carburetor. For further info on this, please Click Here:
A. There are broadly two reasons for fuel leaking from the Carburetor. Either failed Seals or Gaskets. Or there is a Float Needle problem. We go into more if you Click Here:
A. On this type of engine, backfiring through the Carburetor is usually caused by problems in the Cylinder Head. Most commonly, the Valve Clearances need to be reset, or a Valve is stuck but this could also be other problems within the Cylinder Head so the parts need to be examined carefully. You can find a guide to resetting your Valve Clearances and more info, Click Here:
A. There are initially three things to check, the low oil circuit, then the spark plug and ignition coil. For detailed instructions, Click Here: