Yamaha F100C Service Manual page 12

GEN
INFO
Piston and connecting rod
The piston pin has been installed by shrink fitting it to the small end of the connecting rod, as a
result, a circlip is not used to install the piston pin.
The top ring has been nitrided and the second ring has been chrome plated for use with leaded gas-
oline.
The connecting rod and end cap are processed as a single unit. After being heat treated, the single
unit is struck and the connecting rod and end cap are split apart as shown in the illustration. To
increase accuracy during installation, the connecting rod and end cap that were processed together
are always installed as a set.
The hollow volume at the top of the pistons has been made larger and the compression ration has
been lowered to increase reliability and durability.
1 Top ring
2 Second ring
3 Oil ring
4 Connecting rod
5 Connecting rod end cap
1-7
General information
F100B, F100C
F100A
6 Large hollow volume
7 Compression ratio (8.9)
8 Small hollow volume
9 Compression ratio (9.6)
S60C1270
60C5D11