AY50K3/SK3/WK3/WSK3 (’03-MODEL) 12-7
TRANSMISSION
Unit: mm Except ratio
CARBURETOR
ELECTRICAL
Unit: mm
ITEM STANDARD LIMIT
Reduction ratio Variable 2.768 – 1.005 —
Final reduction ratio 14.960 (51/15 × 66/15) —
Drive belt width 16.9 15.9
18.4 17.4
Driven face spring free length 110 104.5
ITEM SPECIFICATION
Carburetor type KEIHIN PWS14
Bore size 14 mm
I.D. No. 35EJ
Idle r/min. 1 900 ± 200 r/min.
Float height 5.1 ± 0.5 mm
Main jet (M.J.) #65
Jet needle (J.N.) N5GJ-3rd
Pilot jet (P.J.) #40
Air screw (A.S.) 1! turns back
Throttle cable play 2 – 4 mm
ITEM SPECIFICATION NOTE
Spark plug
Type
NGK: BPR6HS
DENSO: W20FPR-U
Gap 0.6 – 0.7
Spark performance Over 8 at 1 atm.
Ignition coil resistance
Secondary 4 – 10 kΩ
Plug cap –
B/W lead wire
terminal
Generator coil resistance Charging 0.2 – 1.5 Ω Y – Ground
Pick-up 100 – 270 Ω R – Ground
Regulated voltage 13.5 – 15.5 V at 5 000 r/min.
Generator Max. output 100 W at 5 000 r/min.
Starter relay resistance 50 – 90 Ω
Battery Type
designation
YT4L-BS
Capacity 12 V 10.8 kC (3 Ah)/10 HR
Fuse size 10 A
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