Upper Case - Yamaha Z300A Supplementary Service Manual

Upper case

Water jackets have been incorporated to both sides of the lower part of the upper case. This struc-
ture reduces the heat transfer to the upper case from the exhaust gas.
The cooling water discharged from the water pump is supplied to the upper case around the muffler
from the pipe connected to the exhaust guide, flows down into the water jacket, and then drains to
the lower case.
Water jackets have been incorporated to the exhaust manifold to protect it from the high-tempera-
ture exhaust gas.
Fresh cooling water from the water pump accumulates in the water jacket, and then drains into the
muffler.
1 Muffler
2 Upper case
3 Gasket
4 Upper case water jacket
5 Lower case
6 Exhaust guide
7 Hose
8 Exhaust manifold
9 Water
0 Water pump
6D03F1X
È Water flow
É Exhaust passage
Features and benefits
8