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I have a z50, I love the old bikes. I have a few I like to look at, but are somewhat embarrassing to ride. my Honda express has got me almost run off the road. someone passed me on a grade yelling "get a real bike *****" lol. 7 horsepower + 220lb rider + any sort of grade = barely moving haha. I thought about an Athena big bore kit for the 50cc stuff, but I just can't bring myself to modifying something all original.