2014 Yz450 Crank Breather Mod



33 replies to this topic
  • yzUSMCf

Posted December 12, 2014 - 08:39 AM

#21

I checked my valves and noticed dirt getting into the valve cover through the breather tube so I'm definitely going to do this mod and thought I would share these photos of what I found. I'm wondering if anyone has put foam into the breather cavity in the head to catch this dirt as a alternative to re routing the breather tube?would that be a no no? Just an idea. Re routing the breather tube will be next on my list..

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  • grayracer513

Posted December 12, 2014 - 09:14 AM

#22

Stuffing the tube with foam would probably restrict the crankcase ventilation excessively, and you would be liable to blow the "half moons" out at the cam cover.  You can, however, find crankcase breather filters at auto parts stores in with the "self-help" odds and ends.  Most of them will work, but be sure the inlet barb for the hose is a half inch (12mm), and remember to keep it cleaned.



  • yzUSMCf

Posted December 12, 2014 - 09:17 AM

#23

That's a good Idea too I don't really want to cut into the air boot

  • grayracer513

Posted December 12, 2014 - 09:29 AM

#24

One of the reasons I haven't done this myself, besides the fact that I don't have a problem with dirt intrusion, is the lack of a way to route the rear-running hose from the engine compartment, past the shock hanger (or over it) and into the air box.   If I were more inspired, I would work on it. 



  • SAthump

Posted December 12, 2014 - 10:33 AM

#25

I drop coin for the thumper breather valve

It works!
and makes a farting noise when you shut down;)

  • riderboy1961

Posted December 16, 2014 - 01:01 PM

#26

One of the reasons I haven't done this myself, besides the fact that I don't have a problem with dirt intrusion, is the lack of a way to route the rear-running hose from the engine compartment, past the shock hanger (or over it) and into the air box.   If I were more inspired, I would work on it. 

Something like this? ....

 

                 https://www.youtube....sQsW2vb4i7cuAnw



  • grayracer513

Posted December 16, 2014 - 01:13 PM

#27

Not exactly.  The airbox end needs a filter because the hose run back to the engine from there is short, and the '06-'09 air box is an unusually dusty place.  



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  • yzUSMCf

Posted March 16, 2015 - 10:32 AM

#28

So I checked my valve cover again and there is still debris getting in through the breather tube..sand and even some grass or something so I re routed the tube and added a breather at the end. I didn't realize how large the filter I ordered was. But it works . I did my best to not kink or restrict the tube and found the only place I could mount the filter. Whatcha think?

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  • MxSkater86

Posted March 16, 2015 - 12:55 PM

#29

So I checked my valve cover again and there is still debris getting in through the breather tube..sand and even some grass or something so I re routed the tube and added a breather at the end. I didn't realize how large the filter I ordered was. But it works . I did my best to not kink or restrict the tube and found the only place I could mount the filter. Whatcha think?

 

If you had to re-order a breather what size would you get?



  • yzUSMCf

Posted March 17, 2015 - 01:23 PM

#30

If you had to re-order a breather what size would you get?

1.5 " or smaller...mine is 2" I beleve which is large to fit it places. The breather doesn't need a large filter

  • grayracer513

Posted March 17, 2015 - 01:41 PM

#31

The breather is an avenue for up to 450cc of air plus combustion gasses either coming or going with each half turn of the crankshaft.  Restrict it with too small a filter, and you'll start pushing you cam box gaskets out.



  • yzUSMCf

Posted March 17, 2015 - 01:42 PM

#32

The breather is an avenue for up to 450cc of air plus combustion gasses either coming or going with each half turn of the crankshaft. Restrict it with too small a filter, and you'll start pushing you cam box gaskets out.

that is true! I just think the 2" breather is a little overkill :D

  • dadat40

Posted March 19, 2015 - 12:34 PM

#33

I learned the hard way this weekend, sunk my bike in a very soft sandy creek crossing and it suck it into engine.
My oil filter is completely picked with sand. I don't even think I am going to bother taking it apart.

  • boegey

Posted July 15, 2015 - 11:13 PM

#34

What is the best option to put a filter on the end or to reroute it to the airbox?





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