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ROYAL ENFIELD 350cc and 500cc O.H.V. WORKSHOP MANUAL
2 (f). Contact Breaker Spring
The correct contact breaker spring
pressure, measured at the contacts, is 28-36
oz.
3. Testing Magdyno in Position on
Engine
To locate cause of misfiring or failure of
ignition, check as follows:
(i) Remove the sparking plug from the
engine. Hold the end of the H.T. cable about
1/8 in. from the cylinder block and crank the
engine. If strong and regular sparking is
produced the fault lies with the sparking
plug, which must be cleaned and adjusted or
renewed.
(ii) If no sparking is produced, examine
the H.T. cable and, if necessary, renew it as
described above in Subsection 2 (d).
(iii) Very occasionally the fault may be
due to a cracked or punctured pick-up
moulding. This type of fault is not easily
detected by inspection and a check should be
made by substitution.
(iv) If the Magdyno has recently been
replaced or removed it may be incorrectly
timed (see Section C2, Subsection 4.)
(v) Check the contact breaker for
cleanliness and correct contact setting as
described in Subsection 2 (a).
If the cause of faulty operation cannot be
traced from the foregoing checks, the cause
may be an internal defect in the Magdyno.
The Magdyno should therefore be removed
from the engine for attention by a Lucas
Agent.
1946 MODEL G
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