What vent tube exits by left air cleaner?

[jryan]

What vent tube exits just in front of the left air cleaner? Just wondering...thanks...JR

[V7Goose]

There is a carb overflow tube that is routed in front of the air cleaner on each side. In the stock configuration, those tubes are crossed from the factory, so if you ever see gas running down the left side lower fairing, it is from a stuck float on the RIGHT side (and vice versa).

 

(Just to make things more confusing, I always UN-cross them when I have the carbs out of a bike, so that leaking gas is always coming from the same side as the problem carb.)

Goose

[Guest]

I would seriously consider re-routing that hose away from the lower fairing, or at least make it longer so it hangs down below the lower. On my 99 the fumes from the hose deteriorated the ABS plastic mounting bracket inside the lower left fairing. I ended up piecing it back together with JB Weld and its still holding up. Couldnt figure out why it fell apart like that until I smelled gas fumes in the plastic itself.

[Primebeef]

I would seriously consider re-routing that hose away from the lower fairing, or at least make it longer so it hangs down below the lower. On my 99 the fumes from the hose deteriorated the ABS plastic mounting bracket inside the lower left fairing. I ended up piecing it back together with JB Weld and its still holding up. Couldnt figure out why it fell apart like that until I smelled gas fumes in the plastic itself.

 

 

That is exactly what happen on my '08 RSTD. I had about 250 miles on bike and noticed the ABS had been eaten away on the left side. Went to auto store and bought extra gas line, ran both sides down to underside of bike. Haven't noticed any performance differences or other ill effects...... I highly recommend extending the line, it's easy to do and inexpensive.

[V7Goose]

That is exactly what happen on my '08 RSTD. I had about 250 miles on bike and noticed the ABS had been eaten away on the left side. Went to auto store and bought extra gas line, ran both sides down to underside of bike. Haven't noticed any performance differences or other ill effects...... I highly recommend extending the line, it's easy to do and inexpensive.

Just a different opinion - but I do NOT recommend changing the position of those vents. Doing so will increase the air pollution from fuel fumes without giving you any benefit at all.

 

Those hoses are routed in front of the air intakes for a very specific reason - so that the gas fumes get ingested back through the engine while the bike is running. The vast majority of these bikes have never had any problem at all from the gas fumes behind the lower fairings, so this is NOT a regular problem that you need to prevent. And in the few cases where a problem has been found, it is covered by the warranty. I had the paint near the left vent hose begin to bubble sometime in the first year or two, and Yamaha replaced the lower without question. It has never happened again, so that tells me the problem was a defective paint job, not the gas fumes.

Goose

[jointventure]

Just a thought on extending any passive vent hose, like on the carbs, into the airstream. The reason the ends of the tubes are tucked away is so they do not become siphon tubes or worse, air being forced into them. If you look at the side of any aircraft you will see examples of fuel cell vents in the airstream. They will be angle (slash cut) on the ends. While they are verticle, they have they slashed ends facing fwd for intake and aft for drawing vapors out. These are on slower moving helicopters ( not more than 90mph) as well as fixed wing. Not saying it will cause any issues, but just something to think about. Kinda like sticking a straw into a glass of water and blowing across the top.