As long as there's absolutely, no air leaks, and I must stress, NO air leaks, they do indeed help smooth out the engine
Building A Boost Bottle From A Gatorade Bottle And 4$ At The Hardware Store
If @Street Ryderz sees this thread, he may have some insights regarding the pros and cons of boost bottles. I can guarantee you that he will agree with my assessment of them installed on a basic China Girl motor motorised bicycle...Yamaha originally designed the first one back in 1980 for their...
motoredbikes.com
And Thats all I have to say about boost bottles...A Bogus waste of money and effort for low powered low compression China Girl motors.