the following is what trenga says about boost bottles
There are so many rumors and miss-information about this product, we don't know where to start. This product was developed in '93 by us with the help of White Brother's Racing Department. It is used to stop the hesitation that is prevelant on all Keihin 34 PJ Carbs. We use a Aluminum Manifold that needs a hose connector to the carb (which we never really liked). Some people will tell you to drill out the top of the stock manifold and use it. That is even a worse idea considering the stock manifold is made from a plastic composite which is prone to cracking anyway, and more stress just makes it more likely to. The newer PWK carbs have taken the "hesitation" / Venting problems away. So, unless you are using a 34 PJ, don't waste your money or time to try to use it on any other carb. If you need one, we have them.