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Old 10-19-2021, 10:55 AM   #1
grhanka   grhanka is offline
 
Join Date: Aug 2021
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Pleated paper air filters can't get wet?

Mud on the air filter made my son's 125cc pit bike sputter at high power. Removing the air filter fixed it, but washing the air filter did not. The wet filter restricted the air flow so much it was over-richening the mixture. It ran better the next day, after the filter dried out. Some guy online said paper filters expand and choke off airflow when wet, which is ridiculous, but I think I believe him. We are switching to foam. I just can't believe pleated paper filters can be so popular with such a massive defect. Did I miss something?


 
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Old 10-19-2021, 11:01 AM   #2
JerryHawk250   JerryHawk250 is offline
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Best thing to get is a washable foam pod filter. Wash it out, let it dry out, then oil the filter.
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Old 10-19-2021, 01:45 PM   #3
franque   franque is offline
 
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No, not a defect, just basic physics. Almost everything that is intended for off-road use gets a foam filter, and pleated paper for on-road designs. The exceptions arise with stuff like a Chinese pitbike, where they're built to be as cheap as possible, sometimes using whatever's on the shelf, or sometimes being built to a price point that is as cheap as possible, with a paper filter on the shelf is cheaper than a foam filter they have to order.


 
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