easiest swap is a clone Gx200 carb (the clones are larger than the originals)
I had some good results with Gx340 and Gx390 carbs, but these need manifolds and air filter mods.
here's a link for quick and easy imports from the states:- http://www.affordablegokarts.com/index.php
I made a 'candy cane' header pipe and used an end can from an old two stroke bike to quieten it down a little.(the length of the header affects the torque so experiment)
Have you played with the camgear position on the crankshaft? Here's my take on it...http://www.karting.co.uk/KandK/Tech/MappingValveTiming.html
Brian P.(get your free ebook from www.ukpollards.com while it is still available)
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