Honda 125 CC motorcycle
High Speed Tune Expansion Chamber (Refer to Fig. HKT3)
A. 29.5MM (1.16in.)
B. 30MM (1.18in.)
C. 228.6MM (9.0in.)
D. 35MM (1.375 in.)
E. 404.8MM (15.9375 in.)
F. 85.7MM (3.375 in.)
G. 61MM (2.4 in.)
H. 216.7MM (8.531 in.)
L 101. 6MM(4.0in.)
J. 27MM (1.063 in.)
If engine is to be used for Moto Cross or rough scrambles, the following porting and chamber specifications will yield more torque and less RPM.
High Torque Cylinder (Refer to Fig.HKT2)
A. 73.6MM (2.9 in.)
B. 36MM (1.42in.)
C. 56MM (2.2 in.)
D. Stock
E. 38.6MM (1.52in.)
F. Stock
G. 1.5MM (0.059 in.)
H. 30MM (1.18in.)
I. 29MM (1.14in.)
J. 51MM (2.0in.)
High Torque Expansion chamber (Refer to Fig. HKT3)
A. 29.5MM(1.16in.)
B. 30MM(1.18in.)
C. 175MM (6.89 in.)
D. 32.5MM(1.28in.)
E. 368.3MM (14.5 in.)
F. 86.4MM(3.4in.)
G. 22MM (0.87 in.)
H. 250MM(9.85in.)
I. 200MM (7.87 in.)
J. 22MM (0.87 in.)
K. 15 degrees
L. 8 degrees
CRANKSHAFT AND CONNECTING ROD.
Crankshaft eccentricity should be kept to a minimum. Connecting rod should be bladed and polished and side clearance set at 0.25MM if engine is to be used for road racing.
TRANSMISSION. Wide and close ratio gear sets are available as well as straight cut primary gears.
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