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rev limiter

  1. Poor top end performance in 4th gear

    Engines Discussions
    Hi all. I'm new to this forum. I have a 2017 z125pro that I've had for about 7 or 8 months and has about 3500 miles. The only modification is a removed airbox that was replaced with a k&n filter that the prior owner did. The only thing I've done to it has been to change the oil before winter...