depends, you got an old 1.5 or the new 2.5 they require different shafts. if you have the 1.5 depending on what engine you buy. megatech makes a .16 and hotboddies has an .18 that if you order the right one is a direct swap. if you use an O.S. you will have to cut the shaft. The new 2.5 Siro has an 18 just out that is a direct swap even allowing you to use the ez start.