I am in the process of reassembling my engine. The parts manual shows a part with the
Honda number 12670-286-000 sort of by itself on the page that depicts the cylinder assembly.
It also shows up on the head assembly and is labeled ..... "insert, rubber".. What the heck
is this? In my parts book it has a find number of "3" and is on page 11 and 12.

Could this be those little spacer jobbies that fit between the fins? If so what is the purpose
of these? I note the number used changes between various models.
Putting stuff back together is so much fun.

Jim