I was at the field today and a guy there showed me a boost bottle he installed on his Zenoah 20. He said it smoothed the idle out and help the mid range by making it smoother. Are these things the real deal or not? I found a web site that says they are used on piston port engines and explains how they work. Here's the link:
http://wikiscootia.wikidot.com/boost-bottle
Gimmick or not? Anybody got stuff on these? It wouldn't work for me as my three gas engines are reed valve engines. It looks like they are mainly used on four wheelers and mopeds.