Why is there a slit on the hose inside the airbox.??

[Frozenstiff]

Anyone know why there is a slit on the hose inside the airbox ??. I have a 2007 Apex RTX and notice that the same slit was on the 2006 Apex ER I had as well.

 

[theCATman]

It's there as a safety device if the end of the hose freezes/ices up or gets clogged, the crankcase can still "breath" and let out pressure.

DO NOT silicone or tape it up.

 

[ApexDriller]

Yes it is there as expansion in case hose freezes, it still can breathe.

 

[Frozenstiff]

Thanks for the info guys. Kinda thought that was it but wasn,t sure.

 

[apex4]

hi, what slit on the hose are you guys talking about, is it the 3/4" open on one end? i had trouble back 500miles ago i had a code says "air" looked into air box saw the slit cut taped it up sled started right back up no problems since. if it is a safety system what else would cause this because as soon as we taped it up the fi system pressurized and let the sled start? i am curious as we thought it was fixed and the code once we deleted it never came back. also the sled is always in a heated garage and when it falled i was in front so no snow dust .

 

[170plus]

take the tape off,if the end ever freezes up the crankcase pressure will find a way out and it usually isnt good,blown crank seal maybe,the slit is supposed to be there

 

[Swiss Sledder]

The slit is a good thing. When the RX-1 came out in 03, riders in extreme cold conditions found that snow dust would enter the air box and freeze up, causing pressure to build up and oil shooting out. I learned this the hard way when riding in -38C conditions.

To correct the problem, all Yamaha four strokes beginning in 2004 have a 1" slit in the breather hose.

 

[apex4]

so guys what would be the problem with my sled if i only put tape on the slit and the sled started right up and had no other problems since i just do not want to take of the tape and i fails again

 

[yamadoo]

Apex 4 the slit allows pressure to equalize should the end get snow dust in it, with out it you can get positive pressure in the case and the oil then seeks a 'new path out'. I don't think the slit was the cause of your code, obviously the dissemble and reassembly took care of it. Unsure why, but would recommend you open the slit.

I am not an expert but know some and have heard them discuss this, you need that slit open.

Yamadoo