Working on engines of any kind is my passion and when i bought a motorized bike kit i knew that it wasn't going to spend much time stock. After a lot of research and testing i knew that one of the first mods to do was to add a boost bottle to it, however i didn't want to spend the $30 or more for one when i could make one myself. Well, here it is. The one on the left in the picture is boost bottle #1 and the other is #2. The holes in the end of them are 1/4" that way you can use a 1/4" nipple or drill it out for a larger one.