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Crankcase breather tube soiling outside of airbox

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Hi all,

Last night I completed my first valve adjustment ever (pics soon to follow).

When I took the seat and tank off, I noticed that the outside of the air box and that general area was covered in a mixture of oil and dust, quite thick. I thought the crankcase breather hose actually went into the air box, but it just loops around into a snorkel.

Is this amount of dirt and gunk normal? All I can think of is that an oil level that is too high might exacerbate this, but perhaps it happens on all XRs.

Cheers,

d.

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Don't know about yours, but on US bikes, the California models actually have a nipple on the airbox for the vent to connect to, where-as on the 49 state bikes it is routed to a separator canistor. It's common here to remove the canistor and just route a single vent line from the crankcase nipple to something like a UNI breather filter and locate/zip tie that under the seat.

If the crankcase has been overfilled with oil, it is definately possible/probable to get blow-by out of the vent line. Make sure your oil level check technique is correct and that you're not adding too much. Do a search here for the proper technique if you think you may not be doing it right.

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Well, my bike is a 96 Jap model, the manual says it is a DK type, and in the shop manual there are two illustrations, labelled as "96-97, Except California type" and "After 97, California Type", so that would account for the differences you mention.

Too much oil is a possibility, because despite the fact that I'm quick to remind others of the proper procedure, I sometimes skip it myself (yeah, shame on me). I usually check the oil on a Saturday, before leaving town for a ride, but sometimes I am in a rush or feel very guilty about running my completely de-restricted bike for the 10 minutes required for an accurate reading in our small multi-house driveway. I have often thought of making some sort of temporary butt-plug for the bike, so I can leave it idling and not be such a bother to others.

When I finish putting it back together I'll measure the oil level properly; that should be this afternoon, and I'll report back.

Cheers!

d.

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