When you’ve been building engines as long as Curtis Sparks has, you know a thing or two about squeezing ever ounce of horsepower out of an engine. If you’ve ever wondered what it sounds like in the “lab” when a mad scientist is at work, check out this video of a Yamaha YFZ 450 making a dyno run. We’re not sure what the final numbers were, but we’re guessing they were “healthy.” Apparently people really like the sound of it because the video has garnered over 1.1 million views on Instagram.



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