crankcase breather

when you remove you airbox, what do most of you use for the breather vent, do you, leave the hose on? just leave the vent open, or use a breather filter from an auto shop?? ooh like maybe one of those snazzy ones from the import aisle in pep boys!

Do you mean for crankcase vent ?
If so the I use a little K&N crankcase breather like in the pic www.knpowersports.com/motorcycle_atv.htm about halfway down.

thanks, didn't know k&n made em

I run a hose from the breather over the swingarm. I feel a filter is sort of useless except for keeping bugs from crawling up and nesting. Never had it happen so the hose works for me... You CAN use one of the pretty anodized crank breathers from Pepboys if you like the look... they work as well as any other...

I've seen it routed into the exhaust pipe to be burned or hung over the drive chain for an occassional free drop of oil.

If you want to help prevent blowing oil out, push a coil spring about an inch long into the hose. The oil mist will drop out of suspension, collect on the spring and drain back into the engine.
I run mine under the seat and exit beside the taillight, haven't bothered with a filter.

I also run my mine under the seat and have a K&N filter sitting at the tailight. Even with an S curve in the hose (like a sink trap) I get oil pissing all down my fender after running at high rpms 7000+ for over an extended period.

I'll try that spring trick! anything to help keep the oil in the engine!

Old-Skul - If you have oil coming out the hose, that is called "blow-by" and you have ring problems at a minimum and possibly need new pistons and rings.

You have to be careful with this hose if you have blow-by... If you route it UP or put some loops/bends in the hose, the pressure from the crankcase may be insufficient to blow the oil out and you will blow the engine up if there is no release for the pressure.

There should be no blow-by or very little if the bike's top end is healthy.

The pistons are definetely leaking now. A top end rebuild is in order. And will get started in the next few weeks. It's a pretty hot motor and I've been suprised it's lasted that long.
But it has always had some oil coming out of that hose, even when fresh. In the last months of summer this year it got lots work, but I kept riding the bike one more time, until late November. New pistons and rings are probably in order.