Valve spring wire diameter
.168"
FOR OTHER DIMENSIONS REFER TO 350 c.c. LONGSTROKE
Carburettor
Type
Bore size
Main jet
Slide
Pilot jet
Needle jet
Needle position
Spark Plug
389/1
1E"
250 (no air filter)
3½
30
.106
Central notch
N4
Cylinder bore size
Compression ratio
Piston skirt diameter—top
Piston Ring Gap
Gudgeon pin bush
Con rod diameter
Crankpin diameter
Crank pin rollers
Valve spring free length
Valve spring wire diameter
Timing side bush diameter
high
low
high
low
high
low
3.2505—3.2495"
8.7 to 1
3.3795—3.7870"
.010—.015"
see 350 details
2.016"
2.01575"
1.5156"
1.5154"
½ x ¼" (14)
1A"
x"
.8757"
.8752"
ALL other dimensions as 350 c.c. engine.—For carburetter details see
500 c.c standard model.
Cylinder bore size high
low
Cubic capacity
Compression ratio
Carburettor 1 a" choke
Main jet size—with air filter
Main jet size—without air filter
Throttle slide
Air jet
Needle
Ignition Timing
Spark Plug
Gear Ratios
Top
Third
Second
First
3.386"
3.385"
30.5 cu. in. (498 c.c)
12 to 1
Amal 5GP2
290
310
No. 6
.125"
5GP6 (central notch)
33° to 34° full advance
Champion N57R
7.5 to 1
9.1 to 1
12.7 to 1
19 to 1
500 c.c. Scrambler Model
G85 CS Scrambler USA Model and G80 CS
10
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