Reddit reviews ALPHA MOTO Vacuum Carburetor Synchronization Synchronizer Calibrating Carb Sync Gauges 2 Cylinder Compatible For Motorcycle Bike Honda CB CL 350 XS650 5mm 6mm Adapters
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This vacuum gauge set features 2 precision gauges,Each gauge has its own individual damping control and Calibration ControlThis is upgraded version, it comes with a case and it also contains both 5mm and 6mm adapters for Honda, Suzuki, Yamahait contains 1 qty x 180mm(M5xP0.8) Brass Extension and 1 qty x 65mm(M5xP0.8) Brass Extension and 1 qty x 180mm(M5xP0.8) Brass Extensionand 1 qty x 180mm (M6xP1.0) brass extension and 1 qty x 65mm (M6xP1.0) brass extensionEach gauge has Logo "Alphamoto" on the gauge face.
i would probably get a carb sync tool and go from there. are the rpms all over the place too?
edit: and how did you tune the carbs?
Sounds like you’re doing everything right, I have not hesitated to use a higher concentration of seafoam but it feels like a rebuild is in your future.
Rebuilding the Carbs isn’t difficult and YouTube is full of exact videos on how to do this probably for your exact bike too.
Having a nice, clean well lit work surface is important, Spread out a light colored towel to keep small pieces from rolling, disassemble and lay the parts out exactly as you take them apart, do them one at a time so you still have another carb for reference on how it goes back together. Wear nitrile gloves, good dexterity and saves you hands.
Examine the numbers on your jets so you can get a kit with the same exact parts in it, we don’t know if anything was changed in the past.
Use a good carb cleaner and a stiff toothbrush, not a wire brush. Put your float in a container with gas to be sure they float, take a pic and compare to how the other float floats, pretty important. In fact, taking many pictures along the way is highly recommended.
With two carbs, you may be able to sync them without tools, but a dual vacuum meter setup is the way to go, here’s one.
AlphaMoto Vacuum Carburetor Synchronizer Carb Sync Gauge 2 Cylinder Bike Cb Cl 350 https://www.amazon.com/dp/B004MSJ7C8/ref=cm_sw_r_cp_api_aFG0AbHHTVZK2