Velocity Stack Motorized Bicycle Bike NT Carburetor Carb 66cc 80cc

thingiverse

This is a velocity stack to replace the airbox on the stock NT carburetor on 66/88cc bicycle motors. I made improvements on the aluminum design available by extending the stack down to the hole so there is no gap. (Note: You will have to remove your choke for this part. I didn't experience any issues without it, but your experience may be different.) There is also a 10mm band where you can clamp a 60mm air filter on the stack. I have not tested an air filter on it myself and I don't intend to but I also linked the part file if you want to change it in the event that it doesn't fit on the part. Simply edit the lower plane on the band to change its height. Also a quick note, I've read that certain types of plastic degrade in contact with gasoline so I would research the plastic you are intending on using. You also will likely need to get larger jets if you add this part. I also included the cap I use to cover the stack when not in use (I keep my bike outside). The cap is slightly larger than the stack so that I could use a rubberized adhesive like Shoe Goo to get a better seal from water. You should be able to find this at Walmart or a hardware store but if you don't have access to it you can edit the part with the given files.