lock nut on the adjusting screw, replace the
chaincase cover, and put in about
1
/
3
pint of
engine oil.
On some models a screwed plug is provided on
the face of the chaincase. When this is removed the
chain tension can be checked without removing the
chaincase cover.
8. Timing Chain Adjustment
The timing chain adjuster is a curved slipper
located by two nuts and studs and is inside the
primary chaincase cover which must be removed
(see Subsection 1).
To adjust the chain tension slacken the two nuts
until the slipper can just be moved and retighten it
in a position which will allow a lateral movement of
about
3
/
16
in. of the chain on the opposite side. Put
about
1
/
3
pint of engine oil in the chaincase after
re-fitting the cover.
9. Valve and Pump Timing
If the drives to the camshaft and the oil pump
have been dismantled (See subsections 25 and 26)
they must be reassembled with the timing marks
on the sprockets opposite one another in line with
the centres of the sprockets and with the dots on
the pinion teeth also opposite one another.
Note that, because the idler pinion has one
tooth less than the other pinions, the marks will
only come opposite every 23 revolutions, but this
does not alter the timing once it is set.
For those who wish to check the valve timing,
the opening and closing points are given below:
"250 Clipper" and "Crusader 250"
Exhaust opens 80° before B.D.C.
Exhaust closes 30° after T.D.C.
Inlet opens 50° before T.D.C.
Inlet closes 60° after B.D.C.
"Crusader Sports," "Super 5," "250 Trials,"
"250 Continental,” “GT,” and "350 Bullet":
Exhaust opens 57° before B.D.C.
Exhaust closes 31° after T.D.C.
Inlet opens 27° before T.D.C.
Inlet closes 55° after B.D.C.
The above figures are all given at -015 in. valve
clearance and it is important that this clearance
should be used when checking, as the first part of
the lift, and the last part of the drop are
comparatively slow (particularly on the "250
Clipper" and "Crusader 250" models) and a small
variation in clearance considerably alters the
opening and closing points. For running, set to the
clearance given in Section 10.
10. Valve Adjustment
The rocker clearance is adjusted by means of
adjustable cups which are screwed into the upper
ends of the push rods and secured by lock nuts.
There are no valve tappets as the cams operate
on the push rods through pivoted followers and
the clearance must therefore be measured between
the rockers and the valve stems.
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