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i am about to go buy some oil and a filter for my 400. problem is that i can't find a specific number for the oil filter. does anyone know if it matters which filter to get? i would think that the box would say in the back the model of quads it is compatible with right?
 

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oil filter

Honda uses two very similar oil filters that they say are interswappable but there is a miniscule difference between them, the end cap (metal ) is flanged an extra 1mm outside dia. on the one for 4x4 atv use. I believe it either restricts flow or possibly creates a disturbance that may catch more particles? I honestly don't know but motorcycles and the 400 ex use the higher flow, non-flanged one.

motorcycle and 400 ex one is Honda= #kfo-315, hi flow= hf 113, K&N= kn-113

4x4 atv use one is hm5-a10, hi flow hf-112, kn112 but it will work if you can't get the other................
 

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If you go to a atv shop they will have that info for you. And if its a mail order they should have a section that tells what will fit what.
 

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Honda uses two very similar oil filters that they say are interswappable but there is a miniscule difference between them, the end cap (metal ) is flanged an extra 1mm outside dia. on the one for 4x4 atv use. I believe it either restricts flow or possibly creates a disturbance that may catch more particles? I honestly don't know but motorcycles and the 400 ex use the higher flow, non-flanged one.

motorcycle and 400 ex one is Honda= #kfo-315, hi flow= hf 113, K&N= kn-113

4x4 atv use one is hm5-a10, hi flow hf-112, kn112 but it will work if you can't get the other................

I had K&N 113 on my 2002 400ex, you can find it for around 8 usd/each one.
It also uses 1.95 qtr oil, 4 stroke engine when you replace oil filter.
 
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