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Yep, the screen is just there to protect the oil pump from larger metal shavings and bits in the oil. The actual filtration on these engines, and even most of Honda's small engines like the Grom, is a centrifugal oil filter. It spins the oil at a high rate of speed that separates out particulate. It's actually quite effective.
The Honda service interval on the Grom for this system is 7000 miles.
Does a magnet hurt? No, not at all. You know what helps the most? regular oil changes.
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