the quickest and cheapest changes are typicall clutch mods. The yerfs use the Howhit engine which makes them pretty quick little machines to begin with but with a lower top speed. What I didn't like about ours was the smaller front wheels but seems to me a saw one recently where the guy had put bigger wheels on and it was a totally different machine. Looked fantastic.
A UNI air filter is a cheap and easy mod as well. You'll need to rejet your carb for that.
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