Differences in '73 and '75 175 Motors

[adrian_goold]

Have located a '75 motor here in Oz, but would like to know if anything is interchangable between it and the '73 175 motor?
All i know is the '75 motor is silver and mine is black?
Also is anything else useable on the bike?

Regards,
Adrian

 

[Larry Perkins]

!975 and 1973 175 share many internals and the outer cases are shaped different.  Same basic piston and rod.  In 1976 and 1977 the 175 has a different piston and rod than earlier models.