Fitting tappets and guides. Warm the crankcase, pass the tappet up the
guide hole and put on it the tappet guide. Press the guide home until the
edge of the large diameter is just flush with the crankcase face, the vee
shaped groove should now register with the grub screw hole, fit the
screws.
Timing gear. The cam on all single cylinder models for 1964 will not
interchange with 1963. Single marking is used on all cams, and for identi-
fication each cam wheel is marked with the factory part number. The
500 c.c. scrambler inlet cam is 030124, exhaust 030125. Inlet cam for the
350 c.c. is 030121, the exhaust is 030123. For the 500 c.c. standard engine
the inlet cam is 030122, and for the same engine the exhaust is 030123
(same as the 350 c.c).
500 c.c. Scrambler Model. The alternative piston to give a ratio of 12 to
1 is suitable for the new engine, for use with octane 100 fuel. When this
piston is. used the ignition timing must be put back to 33° to 34° full
advance. For long distance events, the use of a compression plate .050"
thick should be used, to maintain engine efficiency.
Ignition timing all 1964/65 singles.
Maximum advance 350 c.c. 34° (8.9 mm.)
500 c.c. 38° (10.98 mm.)
500 c.c. Scrambler 38° (10.98 mm.)
All with the ignition unit fully advanced.
On coil ignition models the ignition unit can be advanced by using a
tool in the slot provided in the end of the cam.
Carburetter settings.
1964/65 350 c.c. models
type No. 389/208
Main jet, 260 (with or without air filter)
Slide, 3
Pilot jet, 25
Needle jet, .1065
Needle position, central notch
1964/65 500 c.c model
Type No. 389/209
Main jet. 290 (with or without air filter)
Slide, 3.5
Pilot jet, 25
Needle jet, .106
Needle position, central notch
1964/65 500 c.c. Scrambler
Type No. G.P.5 (1 8" choke)
Main jet, 310 (with air cleaner 290)
Air jet, .125"
Slide, 6
Needle, G.P.6, 5th notch.
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