Different Engines & what seems to work the best?

There are two versions of the Shift Kit, being 4-stroke and 2-stroke. The heavy duty versions come with a much better quality sprag bearing and the deluxe version comes with all the tools that are required for servicing the shift kit.
I am only interested in an adapter kit that allows the largest capacity Zenoah engine to fit onto the SickBikeParts shift kit because i want the most amount of torque at the lowest possible rpm, and ideally the engine to be as quiet as possible. I have no interest in a high rpm screamer with a physically large expansion chamber.

As a machinest, you would have to see which version would be the best option for the Zenoah engine:


http://www.sickbikeparts.com/catalog/product_info.php?cPath=21&products_id=29&osCsid=gm8o6p9ui5cu6cf9sd9pltpen6


http://www.sickbikeparts.com/catalog/product_info.php?cPath=21&products_id=110&osCsid=90jta7un2d78pdsp96c091l0u1
 
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