Any clue why?

[Cooksend]

Help me understand this. My recently purchased 600 Hawk has an inline shut off on the carb vent lines. Why would I need to close this? Maybe a homemade tuning tool?

 

[J&L Snowhawk]

never seen before

I would say remove that. a plugged vent hose will cause problems.

 

[cjgodden]

Thats bad news, plugging off those lines will create a pressure in the float bowls and stop fule from entering them. very bad.

 

[cjgodden]

maybe somebody had a leaking needle and seat in the float and was tring to prevent fuel from leaking out the vent line's. Still remove it tho.