Name that part #3

[dealadayray]

This week's feature is NAME THAT PART! Give the name for the part shown in
the picture (this must be what the parts or shop manual says it is) The
first member of the ANZHonda600owners Yahoo Group who has 4 correct answers
will receive a set of engine compartment labels I have had made up.
All are invited to play -
Each part will be significant to the Honda 600 Sedan or Coupe, and no, they
will not all be engine parts. Please read the instructions here and on the
Home page.
Special Instructions:
Yester days part was kind of hard. So this time not only do you have to
name the part, where it fits but what it does to. Also, which car it goes
to, Sedan or Coupe. The answer has to be 100% correct or it will not count.
If there are no correct answers by 9pm PST then I will post the correct
answer.
Following the correct answer for the part there will be a e-mail on the part
including how it wears, trouble or problem areas.

[Joseph Corsinita]

Reverse Idle Gear part # 23451-551-020 for the sedan and the coupe
  Jose