every hard bike to work on be carefull wen pulling crank if dont have right tool can break casing i have 1969 commado 750 -s has ailumaum push rod if you have on that bike be care full on adjust ment bend ease make sher what type motor you have lot differt 750 wen buying parts e bay good place to look parts check were piont are you can get elctornic note biggest problem with bike piont mine are in back most on side look on end shaft if have s on end of shaft were piont are hyebread bike differnt parts sorry about my spelling good luck ps if s on shaft have a every fast bike check id number wen made will tell you year for sure some tiles as 71 are realy 70 hope i helped great bike