Royal Enfield SPRING FRAME O.H.V. 250cc CLIPPER 1954 Workshop Maintenance Manual page 44

ROYAL ENFIELD WORKSHOP MANUAL
If a feeler gauge at least .008 in. thick cannot be
passed between the rotor and each of the stator
poles the alignment should be checked.
The nuts which clamp together the rectifier
plate assembly must not under any circumstances
be slackened. They have been carefully set
during manufacture to give correct rectifier
performance. A separate nut is used to secure the
rectifier to the frame of the motor cycle.
2 (a). Ignition Coil
The ignition coil should be kept clean and
the terminals kept tight.
2 (b). Contact Breaker Unit Model 15D1
(See Fig. 5). Lubrication every 3,000 miles.
(i) Remove the metal cover and lightly smear
the surface of the cam with Mobilgrease No. 2
or, if this is not available, clean engine oil may
be used. On no account must oil or grease be
allowed to get on or near the contacts.
(ii) Lubricate the automatic timing control
mechanism using thin machine oil.
Cleaning every 6,000 miles.
Remove the metal cover and wipe it inside
and outside with a clean dry fluffless cloth.
Examine the contact breaker. The contacts
must be free from grease and oil. If they are
burnt or blackened,
carborundum stone or a very fine emery cloth.
Wipe away any dirt or metal dust with a clean
petrol-moistened cloth.
Cleaning of contacts should be carried out
with the moving contact removed. To remove
this, withdraw the condenser securing screw,
remove the terminal nut and withdraw the nylon
washer. The assembly comprising condenser,
terminal and contact breaker spring arm can now
be lifted out of the unit body.
When refitting this assembly see that the
widest edge of the nylon block is at the top.
2 (c). Contact Breaker Setting
The contact breaker setting should be
checked after the first 500 miles running and
subsequently every 6,000 miles. To check the
gap, turn the engine over slowly until the
contacts are seen to be fully open and insert a
.0014-.0016 in. feeler gauge between the
contacts.
If the gap width is correct the gauge will be a
sliding fit. To adjust the setting, set the engine in
the position giving maximum contact opening.
Slacken the screw at the side of the unit body.
Slide the fixed contact carrier in its slotted hole
until the correct gap is obtained. Retighten the
screw and recheck the gap.
clean with a fine
Section G2d Page 3