my 750 seca will not turn over, my uncle gave it to me, its been sitting for a couple years, I put P B blaster in cyilinders, and removed spark plugs and tried to push it to get it to turn but... can any one suggest some fixes?
Try removing the plugs and spraying a freeing liquid in there and leaving i for a week. Once you get it to turn over, make sure you spin on the starter to get what is left out - otherwise you can get hydraulic lock and seriously damage piston, rod or crank. Then change the oil - as the freeing liquid may have got in to it - worth changing anyway... then put the plugs back in and try to start it. If that does not work you may need to dismantle further to find what it is.