How to choose your Float Bowl. The stock Keihin bowl has lots of places for air to get in when fuel is sloshed. When you land from a jump the fuel sloshes and when you get back on the throttle you might get air not fuel through the jets and have a bog which is scary when you need that acceleration for the next jump. The modified stock Keihin bowl has a leak jet added. A leak jet bypasses the accelerator pump jet. When there is no leak jet all the fuel in the accel pump cover is going through the nozzle, most bikes do not need that much fuel, and can flood. With the leak jet in place the fuel is split between the leak jet and the accel pump nozzle, so the larger the leak jet the less fuel that is going through the the accelerator pump nozzle. Most people like to run a 50-55 leak jet. The R&D Bowl is smooth inside the bowl. This helps with the air sloshing problem. This bowl has an externally adjustable leak jet. Also it has an acceleartor pump cover that has a more evolved design that purges air better then the stock cover so there is less hesitation. Side note most of the aftermarket accel. pump covers have a smaller capacity because they were designed prior to leak jets so there was no other way to adjust the amount of fuel. You also have to remember that the stock covers are the same for one cylinder as they are for multi cylinders, that is why the aftermarket ones have less of a capacity, 1 cylinder does not need as much fuel as 4 cylinders. |
