Breather hose danglling near inlet

[speakerfritz]

So I replaced my inlet covers and filter and while doing that saw a hose to each intake that ran thru a bracket and ended near the intake opening buy not actually connected to the air box.

 

so this is obviously a case breather hose to return unburnt fuel back into the intake. You would think yamaha would have put a hose fitting on the ari box so that this hose can direclty attach?

[RedRider]

There is a small ring bracket in the air filter box to hold the end of the hose. No reason to make an attachment nipple for the hose as that would be a small diameter fitting. More liable to plug up than an open hose. Works fine as is.

 

And, you are right. It is the crankcase breather hose.

 

RR

[ACE50]

If its a gen 2, those are the carb bowl vent lines. They just sit there, supposedly a dead air space.

[RedRider]

If its a gen 2, those are the carb bowl vent lines. They just sit there, supposedly a dead air space.

 

Ummmm, right. Was thinking something else. Good catch.

[speakerfritz]

If its a gen 2, those are the carb bowl vent lines. They just sit there, supposedly a dead air space.

 

 

makes it more interesting...at least its not vented to the exhuast manifold

[V7Goose]

Yes, those are the carb vents/overflow lines, and their proper routing is important on a constant velocity carburetor - they must not terminate anywhere that has abruptly changing air pressure, such as wind or the air-stream at speed. That is why they are stuck up there behind the lower cowlings.

Goose

[Kirby]

Thanks for clarifying this Goose. I've often wondered why they were run all the way up front behind the lowers.