I have an 82 seca 750 so far been a great bike, except when I gun it or just plane give it gas the damn thing acts like the clutch is engaged and no power at all goes to the rear, it just revs up. let off the throttle and give it a little gas she will catch and send power to the rear tire. now this is all while Im moving. I am wondering if there is something wrong with the shaft drive if its a bearing or something weird. I have never had a shaft drive bike before so its a new world to me. If you can help please do. thank you all for your time.