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this 2 are commonly used K&N filters for 250r here
RC-2370
Product Style: Dual Flange Oval Universal Air Filter
Flange Center to Center: 2.625 in (67 mm)
Flange Inside Diameter: 2 in (51 mm)
Flange Length: 0.625 in (16 mm)
Flange Type: Offset
Height: 2 in (51 mm)
Outside Length: 6.25 in (159 mm)
Outside Width: 4 in (102 mm)
Top Style: Metal
Top Material/Finish: Chrome
Filter Material: Cotton Gauze
Base Outside Length: 6.25 in (159 mm)
Base Outside Width: 4 in (102 mm)
Filter Re-Oiling Amount: 0.3 oz (9 ml)
Flange Offset: 0.25 in (6 mm)
Footnote 1: Offset is vertical
Top Outside Length: 6.25 in (159 mm)
Top Outside Width: 4 in (102 mm)
Weight: 1 lb (0.5 kg)
R-0990
Product Style: Dual Flange Oval Universal Air Filter
Flange Center to Center: 2.625 in (67 mm)
Flange Inside Diameter: 1.875 in (48 mm)
Flange Length: 0.625 in (16 mm)
Flange Type: Offset
Height: 3 in (76 mm)
Outside Length: 6.125 in (156 mm)
Outside Width: 3.875 in (98 mm)
Top Style: Rubber
Top Material/Finish: None
Filter Material: Cotton Gauze
Base Outside Length: 6.125 in (156 mm)
Base Outside Width: 3.875 in (98 mm)
Filter Re-Oiling Amount: 0.57 oz (17 ml)
Flange Offset: 0.375 in (10 mm)
Footnote 1: Offset is horizontal
Top Outside Length: 6.125 in (156 mm)
Top Outside Width: 3.875 in (98 mm)
Weight: 1 lb (0.5 kg)
as you can see that RC 2370 is wider than R 0990. thats why the R 0990 has more clearance
I will post a picture when I got the chance
and the flange diameter for R 0990 is tighter than RC 2370. thats why R 0990 is tougher to install
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