What's a good engine that will very easily install into this kart?

[Jake.B]

Yeah 10-15 you should be able to at least go 20 depending on your gearing, you have motor issues. Onces you get them sorted out i think your power improvement will change your mind about spending money on a bigger engine. But if not i have an 8hp briggs and stratton being rebuilt, when im done we could workout a price maybe?