Guys I've made a few boost bottles and my finding are well I'm taking them off. I've even made an adjustable one varied form 40 to 90cc and I can't find anything that great by using one. Sure it will idle with the idle screw turned out more and they make a funny sound when you come off the throttle. To me the idle will stay high then go to so slow a idle speed the engine will die. I've had long connection tubes and short. Big fat and short long ones. and in different cc ranges.
Some of you may like them. I don't, to me I'm glad I made my own and didn't spent the bucks to find out what I did. If you want to argue send me your bottle I'll try it and let you know what I think and teturn it to you I'll pay return shipping. You want to try mine, send me your address and the money to cover the postage, you can have mine. I still have 3 and will soon be cutting them up to make something else.
That is my opinion only, they may be just the ticket for you.
Norman

__________________
norms-iron-works.tripod.com
motor assisted bicycle engine headlights that work off of your white power wire. check it out