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K&N back to foam

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My DRZ has run great for years with a Yosh slip-on, re-jetting (by Yosh specs) and a K&N air filter. I just recently went back to a foam filter (TwinAir) after my mechanic noticed unusual intake valve wear on my YZ and said K&N's are to blame, make sense to me so I changed both bikes back to foam. The YZ had no noticable performance changes but the DRZ has definately lost some bottom-end, even now has a flat spot too. Should I change the main jet? And if so which direction? Thanks ~Mark

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yosh settings are pretty rich and now with the foam filter even more so.

drop a size or 2 onthe main jet.

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yosh settings are pretty rich and now with the foam filter even more so.

drop a size or 2 onthe main jet.

Thanks Burned :banghead:

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Burned, Is there really a problem with K&N filters? Or is it just with some bikes?

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depends on the use.

kn's can pass really fine silt.

i run them on my supermotos,but foam for dirt only use.

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So could a K/N type filter cause intake valve problems.

Is it easier on your intake valves and whatever else, to run a foam filter. :banghead:

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yes,it could just like a poorly prepared foam filter could.

lost of people run kn's for dirt use and swear by them.i have just seen to many dirt leaks with them.most of it is lack of prep.foam filters are alot less critical here.

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