I believe this bike is a 76. I got it from my friends uncle for free. I replaced the clutch cable and throttle/oil injector cable. My main problem now is that the exhaust pushed right into the flange. it can wiggle freely as it sees fit. I was wondering if there is something im missing. I see a circle for a spring on the pipe but there is none on the motor or flange i can see. What am I missing? Thank you guys!