Does a WR450 sans starter need the crankcase vent ?

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.

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.

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.

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

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.

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....

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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