Go to the bottom right hand corner of this page.In the search bar that says search this forum put in 60cc,thats all.then go down tpo the bottom of the search results and click on the post that says[whats a good 60cc+/- conversion engine].Thers a pic of a 60cc conversion done by Ken lambert.
www.lambertsrc.com
dont know what hes doing anymore since he moved.That might be one of his,especially the muffler.