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ENGINE MISSES AT LOW SPEEDS ONLY
POSSIBLE FAULT
REMEDY
1.
Air leaks in system.
Check joints between:
a) Cylinder head-and-intake manifold
b) Carburettors-and-intake manifold.
2.
Carburettor setting faulty.
Adjust carburettors.
3.
Valve not seating properly due to:
a) Incorrect valve clearance.
Check and adjust.
b) Burnt or bent valve(s).
Remove cylinder head and
renew parts.
ENGINE MISSES AT ALL SPEEDS
1.
Carburettor flooding.
a) Remove and clean needle valves.
b) Check that floats are not punctured
or damaged.
2.
Faulty spark plugs.
Remove, clean and set plug points
and, if necessary, fit new plugs.
3.
Plug leads loose or damaged.
Examine and, if necessary,
fit new plugs.
4.
Plug-lead(s) insulation faulty.
Renew leads.
5.
Faulty valve operation due to:
a) Broken valve spring
Examine and renew defective parts.
b) Valve sticking in guide.
Check and clean valve guide.
c) Incorrect valve clearance.
Check and adjust.
d) Bent valve(s).
Remove cylinder head and
fit new valve(s).
6.
Weak mixture due to :
Fuel filter being partially blocked.
Renew fuel filter.