Finally, pictures! The throttle for the GY6 carb is just about done. It came with two metal ends bent at about a 70* angle. I took one side and bent it straight with a vice and adjustable wrench. I also bent the other one to about 100*. This picture shows the little lengthener piece I had to print to get the cable to reach the pedal:
I also had to put the cable bracket on the carb to the "underhand" position. I'll have to make a plate for it because it is only supported by one screw this way:
Here's a picture of the hand choke conversion:
Now I had to print the entire intake boot in Ninjatek Cheetah TPU (rubber in laymen's terms) because it needs to flex to get a seal around the carb outlet. This works completely fine for the carb end, but the rubber flexes at the flange bolting to the motor, causing vacuum leaks as the carb bounces. Not only that, but the TPU is only rated to 180*F. For now my solution was to mill the bowl vent channel out of the stock insulator, slap it between the boot and the head, and drown it in silicone. This "works" temporarily. I will have to get either Colorfabb PA or PA-CF (nylon or carbon fiber-reinforced nylon) that is a stiff plastic good to 250*F and dual-extrude it with the TPU to get a high-temp, rigid flange and a flexible boot.
In stock configuration through about a stage 2.5 configuration, it would make it up my steep trail but SLOWLY, just about smoking the belt. I took it for another spin today and I spun the tires all the way up the hill. It also managed the first sustainable donut of its life. By far the GY6 carb brought the most power of all the upgrades in the engine!
I also had to put the cable bracket on the carb to the "underhand" position. I'll have to make a plate for it because it is only supported by one screw this way:
Here's a picture of the hand choke conversion:
Now I had to print the entire intake boot in Ninjatek Cheetah TPU (rubber in laymen's terms) because it needs to flex to get a seal around the carb outlet. This works completely fine for the carb end, but the rubber flexes at the flange bolting to the motor, causing vacuum leaks as the carb bounces. Not only that, but the TPU is only rated to 180*F. For now my solution was to mill the bowl vent channel out of the stock insulator, slap it between the boot and the head, and drown it in silicone. This "works" temporarily. I will have to get either Colorfabb PA or PA-CF (nylon or carbon fiber-reinforced nylon) that is a stiff plastic good to 250*F and dual-extrude it with the TPU to get a high-temp, rigid flange and a flexible boot.
In stock configuration through about a stage 2.5 configuration, it would make it up my steep trail but SLOWLY, just about smoking the belt. I took it for another spin today and I spun the tires all the way up the hill. It also managed the first sustainable donut of its life. By far the GY6 carb brought the most power of all the upgrades in the engine!