rod can be felt, unscrew the adjuster exactly half a turn and retighten the
lock nut, taking care the adjuster does not move. Complete the adjust-
ment by unscrewing the clutch cable adjuster until there is x " movement
between the outer casing and the adjuster, tighten the lock nut. Replace
the inspection cap.
Clutch slip should be dealt with promptly otherwise the friction plates
will be damaged and the clutch springs affected by heat. The normal free
length of the clutch springs is 1¾", the clutch push rod length is 10".
LIGHTWEIGHT GEARBOX MAINSHAFTS
350 c.c. Lightweight. Mainshaft 041701 was fitted to gear boxes with
numbers from zero to 3757.
An improved type mainshaft 041703 was first used in gear boxes 3758
and onwards.
250 c.c. Lightweight. Mainshaft 041263 is used on gear boxes from zero
to 9974, also to gear boxes between numbers 10064 to 10128 as a tem-
porary measure.
A modified shaft type 043058 is used in gear boxes with numbers 9975
to 10063 inclusive, which is now the current type.
The dimensions affecting the various mainshafts are given in Figs. 15
and 16, the drawings are to scale.
NOTE—The shaft dimensions affect the vaned shock absorber centre. For
mainshafts 041263/041701 use shock absorber centre 043186. For main-
shafts 043058/041703 use shock absorber centre 013509.
THE GEAR BOX
Heavyweight Models
Gear box faults. If difficulty in changing gear from top to third and where
it has been ascertained that the clutch is not dragging, the fault can be
rectified by attention to the gear change stop plate (55). Take out the
plate bolts (73), disconnect the pawl spring. Draw out the two plate holes
by elongation to the extent of Q" to enable the plate to go upwards
towards the top of the case. The plate must be retained in this position
whilst retightening the two bolts. Should the fault occur when changing
into a higher gear, elongate the holes in the opposite direction to the same
amount, so that the plate can be moved downwards.
To summarise, if the fault is in changing down move the plate upwards,
conversely if the fault is when changing up, move the plate down.
If gear selection is generally uncertain, first verify the location of the
pawl spring (88). If this spring is distorted or fitted upside down, gear
selection will be uncertain. The correct position is with the straight leg
of the spring uppermost.
Oil teaks from kickstarter axle. Check oil content by removing level plug
(87), normal content one pint, or 20 fluid ozs., if normal. Renew the 'O'
ring (69) see details 'removing bushes',
Wear on kickstarter pawl (41). Usually due to a weak kickstarter return
spring, causing the crank to depress by inertia over bumpy road surfaces.
If the crank is too far away from the vertical position the inertia will
increase.
Position the crank approximately 20° left of the vertical position.
60
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