2014 drz400s oil in air box problem

[billyreilly1020]

So I resently rebuilt my drz with a plus 4 stroker crank and 470cc and hotcams new head new bearings and seals just got it back together got its started ran fine but quickly notice a mass of oil it is in the air box and carb like about half a quart of oil on the ground please help I'm getting frustrated need a nap

[HansLanda]

I have this problem when I do tall wheelies. Still unsolved in my case. I wonder if it's a big bore issue. Very few of my stock bore friends have this issue. However I only have a 434 where you have the 470.

If you simply want to keep oil out of the airbox, you can cap off the airboot port with a 3/8" ID vacuum line cap. You can go to O'Rilleys and get some fuel line hose to elongate hose 16 (the one that would go to the airboot) and either route it to the ground or put it up high with a breather (Uni Filter UP122). Currently I am doing this. It has not solved my oil separation problem during wheelies, but at least it routes it away from the airbox.