switching clutchs 10cc to 150cc?

[ben]

I have a pagsta w/ dadyw 100cc. you know that thing that comes outta the motor that turns when you shift? you call that the shift arm right? well, the first part of my shift assembly (the round thing that goes around the shift arm, connects to my shift linkage) it snapped, and I have absolutely NO way of finding one (looked online, junkyards, craigslist) but yesterday I bought a 150cc UM motor. I was wondering, can I just replace the clutchs? or idk how that would exactly work. anyways, any ideas or input would be appreciated! thanks!