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Product Description
This is a original NOS Fast Arrow power box / boost bottle for 2 stroke engines Basically this chamber / bottle holds a charge of air and fuel mixture and his ready for you once you are back on the throttle. Similar setups are found on the Yamaha Banshee, YSR50 and many other high performance two stroke engines. Look below for more details of the boost bottle phenomena.
The brass fitting installs on your intake and the bottle can be mounted onto the frame, air box close by.
Everything in picture is included.
Boost Bottle theory is that the boost/equalizer /tube/bottle is a passageway between intake manifolds with a fixed volume, usually the CC of one cylinder or larger, a (momentary) storage container for pre-atomized fuel/air mixture. Since the fuel/air mixture is at a high velocity while traveling through the intake manifold, guess what happens when the reeds suddenly close? The mixture has inertia and physics would suggest the fuel/air mixture has to dissipate this inertia, through a tube maybe? This inertia (pulse) forces the pre-atomized mixture that’s already in the tube from the previous cycle into the next intake manifold that’s reeds are just opening and ready to receive the fuel/air mixture, this is like a little supercharger to each cycle. This all happens so fast at higher rpm’s that it is most effective at lower and mid-range where you are on/off throttle. It takes venturi velocity to atomize the raw fuel from the main jets. The tube/bottle has a charge of pre-atomized fuel that is instantly ready when you go from off to on throttle. It assists in filling the cylinder for a fraction of a second until the carburetor venturi gets enough velocity to fully atomize the available fuel. The advantage is that it brings up the torque and horsepower sooner in the bottom of the rpm range.
