they're cheap, non rebuildable, and made for a massively wide range of go kart applications that leaves them being not much more than a glorified spring that looks cool to the consumer. finding a good shock will do a ton to enhance the suspension and overall feel and performance of the buggy.
back to your engine choice, one thing a lot of people forget is that every commercial go kart in the world just about uses 6.5 to 9hp industrial engines. not one out there with a 150/250cc gy-6 type. I'm in the middle of designing a track and adding an 18 kart fleet to my business. hoping to be open this coming spring.
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