HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
MidlifeCrisisGuy

Does a WR450 sans starter need the crankcase vent ?

7 posts in this topic

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.

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

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....

Share this post


Link to post
Share on other sites

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 !

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0