Does a WR450 sans starter need the crankcase vent ?


6 replies to this topic
  • MidlifeCrisisGuy

Posted August 23, 2013 - 10:39 AM

#1

I removed the starter on my 2012 WR450. The starter housing has a crankcase vent built into it. Now that I removed the starter, do I need to keep the crankcase vent or can I plug it off ? As far as I know the YZs did not have a crankcase vent, only a valve cover vent. Thanks.

  • MidlifeCrisisGuy

Posted August 23, 2013 - 03:51 PM

#2

The lubrication diagrams for the 2009 YZ450F and the 2012 WR450 look identical. I suspect the starter breather on the WR450 is needed to prevent oil lock or facilitate oil flow to the starter idler gear.

  • fixitandy

Posted August 24, 2013 - 02:16 AM

#3

G'day, I blocked my starter vent on my brand new WR 450 07 the night I bought it home, never had any issues with motor/ trans ever. ROOSTA out.

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  • Krannie McKranface

Posted August 24, 2013 - 09:03 PM

#4

That vent is not a 'crank pressure breather' its a 'moisture remover' vent.



  • MidlifeCrisisGuy

Posted August 25, 2013 - 07:47 PM

#5

That vent is not a 'crank pressure breather' its a 'moisture remover' vent.

Why doesn't the moisture vacate via the valve cover ?

 

I removed the starter and plugged the hole with a frost plug.   It worked perfectly.     I removed the gearcase vent and plugged it off.   I went for a 3 hour ride with no issues.



  • Krannie McKranface

Posted August 25, 2013 - 08:58 PM

#6

Why doesn't the moisture vacate via the valve cover ?

 

I removed the starter and plugged the hole with a frost plug.   It worked perfectly.     I removed the gearcase vent and plugged it off.   I went for a 3 hour ride with no issues.

 

Just don't plug the valve cover breather....or you will get a loud surprise...the valve cover semi-circle gaskets come exploding out the side of the motor in about 15 min.

 

Not that I would have personal knowledge of this or anything....



  • MidlifeCrisisGuy

Posted August 27, 2013 - 11:00 AM

#7

Just don't plug the valve cover breather....or you will get a loud surprise...the valve cover semi-circle gaskets come exploding out the side of the motor in about 15 min.

 

Not that I would have personal knowledge of this or anything....

LOL.  Thanks for sharing that !






 
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