Specifications

SPEC
L-20
DESCRIPTION SPECIFICATION
Stem outside diameter IN 4.975 ~ 4.990 mm
EX 4.960 ~ 4.975 mm
<Limit> IN <4.950 mm>
EX <4.935 mm>
Guide inside diameter IN 5.000 ~ 5.012 mm
EX 5.000 ~ 5.012 mm
<Limit> IN <5.035 mm>
EX <5.035 mm>
Stem to guide clearance IN 0.005 ~0.0325 mm
EX 0.0125 ~ 0.026 mm
<Limit> IN <0.075 mm>
EX <0.075 mm>
Stem runout limit 0.010 mm
Valve seat width IN 0.9 ~ 1.1 mm
EX 0.9 ~ 1.1 mm
<Limit> IN <1.6 mm>
EX <1.6 mm>
Valve spring :
Free length IN 39.62 mm
EX 39.62 mm
<Limit> IN 38.17 mm
EX 38.17 mm
Set length (valve closed ) IN 25.6 mm
EX 25.6 mm
<Tilt limit> IN 2.5°/1.7 mm
EX 2.5°/1.7 mm
Compression pressure (installed) IN 142-221 Nm (14.5-22.5 kgf)
EX 142-221 Nm (14.5-22.5 kgf)
Direction of winding (top view) Clockwise
Crankshaft :
Crank width “A” 46.95 ~ 47.00 mm
<Runout limit “C”> <0.03 mm>
Big end side clearance “D” 0.15 ~ 0.45 mm
<Small end free play limit “F”> <0.8 mm>
Shifter :
Shifter type Cam Drum and Guide bar
Kick starter :
Kick starter type Kick and mesh type
Kick clip friction force 7.8 ~ 11.8 Nm (0.8 ~ 1.2 kgf)
2-6
MAINTENANCE SPECIFICATIONS