Lower Case - Yamaha Z300A Supplementary Service Manual

GEN
INFO

Lower case

The propeller shaft housing and the ring are newly designed to reduce the exhaust back-pressure
and cool the propeller damper.
Cooling water is taken in from the front of the trim tab, flows through the pipe in the lower case and
propeller shaft housing, and then is supplied directly to the propeller boss.
This prevents the cooling water from mixing with the exhaust gas in the exhaust passage in the
lower case and also prevents the cooling water from obstructing the exhaust gas.
Therefore, the exhaust back-pressure can be reduced.
A low gear ratio has been adopted to match the power output characteristics.
1 Water pipe (for cooling the propeller boss)
2 Heli-sert bushing
3 Ring
4 Fluorine-coated oil seals
5 Propeller shaft housing (with water passage)
È Water flow
É Pinion gear
Ê Reduction gear
9
General information
Ë
Model Gear ratio
Z250 1.81
Z250F
1.75
Z300
Ì
Identification
Model
mark
Z300
60X1
LZ300
Í
Identification
Model
mark
F 60X00
Z300
R 69L00
F 6D100
LZ300
R 6D100
Notes
Same as Z250F
Notes
Same as Z250F
Same as 250C
New
New
6D03F1X