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XR650L Crankcase Breather Filter

Posted: Sun Apr 07, 2019 1:33 pm
by BarkSlayer
Hey guys...I picked up a 2005 XR650L last weekend. The bike has 7700 miles and is in excellent condition. It appears at one point though, the engine oil may have been overfilled, as everything behind the cylinder was coated with oil that I’m guessing was forced out through all the connections in the separator hoses. I removed the smog pump and oil separator, but need a recommendation for a crankcase vent filter that I can install now to the crank vent fitting. What works best and where can I get one?

Re: XR650L Crankcase Breather Filter

Posted: Sun Apr 07, 2019 3:04 pm
by JoeRC51
As the piston goes up and down 650cc's of air goes in and out of the breather , when it blows out it carries oil vapor. The oil separator condenses the vapor and allows it to be drawn back into the motor. It's best to leave the breather set up as it came from Honda.

Re: XR650L Crankcase Breather Filter

Posted: Sun Apr 07, 2019 7:31 pm
by BarkSlayer
Thanks, Joe. I didn’t look closely, as it was an oily mess but can the separator be opened and cleaned before installing again? I’d hate to have to buy new parts for that.

Re: XR650L Crankcase Breather Filter

Posted: Sun Apr 07, 2019 10:17 pm
by 4Strokes
I believe some folks used a UNI #UP-103 clamp-on style air filter.

https://unifilter.com/online-catalog/cl ... r-filters/
E6BD3C24-8B07-4798-B360-12F026160FCB.jpeg
UNI #UP-103

XR650L Smog Block-Off Carb Pics
092DA776-1213-472C-8111-EE139573EB3A.jpeg
Uni filter UP-103

Or the Push-In type UP-123 (Read "Smog Block-Off Carb Pics" page).

Re: XR650L Crankcase Breather Filter

Posted: Mon Apr 08, 2019 12:32 pm
by JoeRC51
And you'll end up with oil all over the place.

Re: XR650L Crankcase Breather Filter

Posted: Mon Apr 08, 2019 3:44 pm
by 4Strokes
Personally I would leave the stock separator too, Joe. I'm simply just giving the visitor the info they were asking about.

BarkSlayer: If you search the forums for "UP-103" and "UP-123" you will find threads on this topic as well.

UP-123: search.php?keywords=UP-123
UP-103: search.php?keywords=UP-103