6D03F1X
4
Features and benefits
1
Crankcase and cylinders
The following modifications have been adopted to increase the output as compared to the Z250
power unit.
• The material of the crankshaft has been changed to a high-grade clean steel
(*1)
to increase dura-
bility against stress.
• Wider exhaust ports with planed-off edges have been adopted and the exhaust timing has been
changed to reduce the exchange loss of the exhaust gas.
• Cooling water jackets have been incorporated to the crankcase to increase engine-cooling ability.
*1: Steel with decreased nonmetallic inclusion content
1
Crankshaft identification
Identification mark: 2 mm (0.079 in) punch mark
2
Exhaust port
3
Crankcase water jackets
È
Water flow
Identification / Features and benefits
