That is the lever that you turn to operate the choke manually.
It has two positions, automatic and manual. If it is not leaking fuel and the engine starts and run properly, don't worry about it.
There are replacement parts available for it, what is your engine model number?
As Daviet says, its a manual primer lever. It also can come equipped with a shrader valve on the end which will allow you to connect BRP fog or decarb aerosol cans.
That is the lever that you turn to operate the choke manually.
It has two positions, automatic and manual. If it is not leaking fuel and the engine starts and run properly, don't worry about it.
There are replacement parts available for it, what is your engine model number?
