Suzuki FZ50 restriction?

Nash . /
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anybody know if these were restricted in america/iowa?

i bought one yesterday, and it runs well but bogs down and 4-strokes near 25mph. for a short while today i overcame it and was going really fast, but then all of the sudden it started 4-stroking again and bogged back down.

anybody know what i can do to change this?

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