icr~fi~col
Data
THUNDERBIRD
(6T)
TECHNICAL
DATA
ENGINE
Type
..
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.
.
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O.H.V. Twin
0.5
P.
at
R.P.M.
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...
...
.
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34
at
6300
Bo-c
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...
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..
2.79 ins.
(71
rnrn.)
Stroke
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...
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...
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3.13
ins.
(82 rnrn.)
Capacity
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... ... ...
...
...
.
40
cu. in. (649 c.c.)
Compression Ratio
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.,.
7:1
Valve Clearance (Cold)
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0.010 in. (0.26 rnm.)
Valve Timing:-(with ,020 in. Tappet clearance for checking)
Inlet Valve opens B.T.C.
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26f
Inlet Valve closes A.B.C.
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69f0
Exhaust Valve opens B.B.C.
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61
Exhaust Valve closes A.T.C.
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...
.
,
.
35i0
IGNITION
Distributor Contact Point Gap
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0.01 4"-0.016"
(0.36-0.40 rnrn.)
Distributor Range
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15"
Sparking Plugs
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Champion L10S
Sparking Plug Gap
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0.020" (0.50 rnm.)
Ignition Timing (Fully Retarded):
Crankshalt position
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6' B.T.C.
Piston position
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4"
(0.8
mrn.) B.T.C.
CARBURETTER
Type
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S.U.
M.C.2
Needle
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M
.9
TRANSMISSION
Gearbox-Type
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Positive selection
(Foot operated)
8
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