WOOPS! What part is this?

[Savard]

it goes in between the reverse gears, the smaller gears that touch the big bottom one. if you pull those two smaller gears apart you will see a small hole that it sits in. not sure what its for but i noticed it when it fell out of mine during track swap. part 59 in the picture.

 

[Dimebag]

No, its not one of the springs between the reverse gears. Way too big.

 

[canoehead]

Looks like an exhaust valve spring from a an old 2 smoke or check your "reverse handle rod" there's a similar dampening spring on that.

 

[Sled Dog]

Did a buddy throw this spring into your bolt bin to have some fun with you?