11 --- General causes
Fuel system fault. See Chapter 5 - Fuel & Oil.
Ignition malfunction. See Section 9, 'Weak spark at plug'.
Fuel contamination. Clean the filter and, where water is in evidence, drain and flush the fuel tank.
Intake air leak. Check for security of the hose connections, and for cracks or splits in the hoses.
Air filter blocked or omitted. A blocked filter will cause an over-rich mixture; the omission of a filter will cause an excessively weak mixture. Both conditions will affect the mixture ratio adversely. Clean or renew the filter as necessary.
Fuel filler cap air vent blocked. Usually caused by dirt or water. Clean the vent orifice.
© March 2015