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Here is my solution to starting a 100 cc twin without wrecking your right arm and suffering cut hands and fingers and quite possibly an unintentional prostate removal ! It consists of a scrap junk of 3.5 inch exhaust tubing trued up and welded on a lathe, an old 7/16 head stud bolt( with threaded end cut off and smoothed), and a scrap of foam rubber tubing from the bump bar of some scrapped exercise equipment , that I found at our Municipal dumping yard! Makes my cheap azz BH 100 start almost as fast as a shiny DA!Total cost---- Dunno. I quess nothin!