1964 to 1966 DATA
Ignition timing with full advance
350 c.c. model
500 c.c. model
500 c.c. Scrambler (8.7 ratio)
Carburettors
350 c.c. model type
main jet size
Slide
Pilot jet
Needle jet
Needle position
500 c.c. model type
main jet size
Slide
Pilot jet
Needle jet
Needle position
34° 8.9 mm.
38° 10.98 mm.
38° 10.98 mm.
389/208
260
3
25
1065
Central notch
389/209
290
3½
25
1065
Central notch
The new chain sizes are:
350 c.c. front
500 c.c. front
350 c.c. rear
500 c.c. rear
68 links
69 links
98 links
99 links
Note—1963/64 models have 18" wheels which affects gear ratios; to
remedy all heavyweight engines have one more tooth on the engine
sprocket.
GEAR RATIOS
Scrambler Models 1957 to 1959
Internal Ratios
First
gear
2.67
Second
gear
1.77
Third
gear
1.35
Fourth
gear (top)
1.1
Sprocket Sizes
Rear wheel
Clutch
Final drive {gear box)
Engine
Chain Sizes
Front chain
Rear chain
Valve lift—inlet cam
Valve lift—exhaust cam
54 teeth
42 teeth
16 teeth
19 teeth
½" x .305" (67 links)
a" x s" (104 links)
.442"
.339"
For all other technical details refer to the 500 c.c. regular Scrambler.
Note—Lubrication system is same as 1964 regular engine.
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