New air filter; now top speed is 15 mph

Maria W /
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I got my 1978 Vespa Bravo off of ebay in good working condition break>

So I put the thing on, and now the moped starts and runs better (I had trouble before) but its maximum speed is now 15 mph where before it was 25 mph with a makeshift filter. What could be wrong? Could I have the wrong air filter? Could I have installed it wrong? To tell the truth, I can't figure out why the whole plastic thing is attached, it only seems to restrict the air to three small holes. Can I punch more holes into the plastic housing without negative consequences?

I should add, we took the carburetor off and cleaned it before I put in the filter, so that's not the problem.

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