Looks like is primarily a pricing/parts thing. Free exchange plus you get the new engine ID card in the process.
http://www.worldkarting.com/index.php/news/121-most-recent-pit-boards/962-10-22-2014-tillotson-hw-27a-carburetor-approved-for-iame-x30
I’m not seeing a downside here. They also dropped the TaG weight limits.
Is there any performance gain
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