I just bought a nice used yerfdog gocart... Motor starts fine and I believe I have the correct belt with flat side towards the engine... When you give it gas the first pulley causes the belt to create tension but not enough power to make it move... I suspect the torque converter with the green spring. Is there a way to try and adjust the spring tension before replacing anything? Any tips or help would be appreciated... I am new to forum and gocarts...lol