damage to the oil seal during the process of refitting the cover, a guide
tool is used. The tool is fitted over the shaft for the cam wheel, with a
little oil on it to guide the seal over the shaft. The seal should be fitted
in the cover with the metal backing facing outwards, Clean the lace of the
cover and stick a new gasket to it. The cover 024016 can now be put back
with three screws 000482,
Resetting the ignition timing. Fit the automatic timing control (make
sure the weights move freely, apply a spot of oil on the pivot pins) and
the contact plate, and roughly assemble the timing control. Set the
ignition before fitting the cylinder head as the piston travel can be
measured more easily.
Follow details for setting ignition timing previously described.
The general arrangement of the standard and sports versions are similar
in respect of engine design. The bottom part of the engine, excluding the
flywheels, is similar to the earlier type engine.
Service details given for the 350 c.c. Heavyweight model apply also to
this later type engine.
The push rod tunnels are integral with the cylinder, with oil seals in a
recess in the cylinder barrel. Scrambler type valve springs are also used
for high r.p.m. The compression ration is 8.5:1.
This engine develops considerably more b.h.p. than the earlier type.
A list of parts that differ from the earlier type are tabulated:—
350 c.c. G3-16
028106 R/Box steady bolt
029318 R/Box steady bolt
028100 Head gasket
028596 Push rod assy.
022518 Push rod rubber
028104 Cylinder head
026030 Inlet guide
024519 Exhaust guide
026028 Inlet valve
028105 Exhaust valve
026861 Valve spring
026862 Valve spring
028531 Crankcase assd.
028102 Cylinder base stud
028095 Cylinder barrel
028101 Cylinder base gasket
(New Parts)
014044 Valve spring collar inlet and
exhaust
014042 Valve spring collet inlet
014039 Valve spring collet exhaust
015422 Rocker box
028123 Carburetter
041014 Carburetter O ring
015875 Carburetter spacer
028107 Piston
028114 Piston ring chrome
028115 Piston ring plain
028116 Piston ring scraper
028113 Gudgeon pin
028097 Flywheel T/S
028096 Flywheel D/S
015351 Cylinder stud nut
042157 Cylinder stud washer
Basically the design of the two above models is identical, with the
exception of the bore and stroke.
1962 350 c.c. Short Stroke Engine
Scrambler Models CS and TCS
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