Morgan Carbtune Pro 4-Column Throttle Body - Carb Synchronizer Carbtune Pro motorcycle throttle body & carburetor synchronizer will easily and accurately sync the throttles on motorcycles, 4-stroke outboards and snowmobiles. Independently tested to be the best and most accurate way to synch the throttle bodies on your bike. Much easier to use and more accurate than a Twin Max and more affordable. Carbtune uses stainless steel rods so there are no hassles with poisonous mercury. No calibration or set needed, easy to follow full instructions are included as well as adaptors for various applications. The 4 column model is ideal for BMW triples, 4 cylinder models and twins. Storage pouch now included!