China foam
Do you wash and re-oil your filters?
I think the manual sez you can do this 5 times.
If the china foam doesnt get gooey or turn to crumbs, I don't think there would be a problem, as long as the pores in the foam are the same size.
The FAQ at Ninja250.org sez the foam filters perform as well as the oiled cotton and other types.
I just bought a china foam filter, but won't put any run time on it until spring and I live near a rain forest. The air is pretty clean.
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