AJS 350 1954, Maintenance Manual And Instruction Book, Page: 78 / 96

Illustration 29
Showing component details of Contact Breaker
To clean, check and adjust contact breaker points (Magneto type N1-4)
If dirty, oily or burnt, contact points must be cleaned with a fine carborundum stone or
very fine emery cloth and afterwards wiped with a cloth moistened with petrol.
Cleaning is made easier if the spring arm A (Illustration 28) is removed. To adjust
turn over engine until the points are fully open. Insert the gauge (Part of spanner
017251) which should be a sliding fit. If there is appreciable variation from the gauge,
Slaken the lock nut G (Illustration 28) with spanner 017251, then with the same spanner
turn the screw inward to increase the gap or outward to decrease it. Finally tighten
the lock nut and re-check the setting.
On the SR-1 magneto fitted to 500 c.c. models, the contact breaker is exposed by re-
moving the moulded end cover secured with 3 captive screws,
To remove the contact breaker lever, slacken the nut securing the end of the contact
breaker spring which is slotted to permit easy withdrawal of the moving contact lever.
Adjustment of contact breaker (Magneto type SR-1)
If and when adjustment is necessary slacken the two screws securing the fixed contact
plate and adjust the position of the plate until the gap, when the contacts are fully
opened, is set to the thickness of the gauge. The correct gap should be .010 to .012.
Special Notes (all models)
Check the contact breaker gap after the first 500 miles. Owing to the initial settling
down there is a tendency for the gap to alter in the first few hundred miles of use.
Subsequent adjustment will only be required at long intervals, but it is nevertheless
advisable to check every two thousand miles.
Lubrication
All magnetos are provided with ball bearings on the driving shaft. These bearings are
packed with grease upon assembly and require no attention for a considerable time.
About every two years or when the engine is undergoing a general overhaul the
magneto should be dismantled at a Lucas Service Depot and the bearings re-packed
with high melting point grease.
CONTACT BREAKER
BODY
TAPPET
BACKING
SPRING
CONTACT
ARM
LOCKING
PLATE
CONTACT BREAKER
SECURING SCREW
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