This is ready to bolt on and go, these are the larger valves for the engines that are rated 12.5 hp. Most Chinese go-karts
have the smaller valves that produce 9hp. Inexpensive way to increase horsepower.
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I bought this to replace one on my Kart that was in bad shape. It fit perfectly and revived a dying kart. I’m hoping to get a few more years out of it till the grand kids can by their own transportation.
Would recommend for easy replacement. Better quality than other cheap heads I've seen