I picked up a 72 cl450 last week hoping to fix it up quickly with parts from my old cb450 if necessary. I was told the engine was good and just needed the clutch hooked up and a new side cover gasket. Well I put it together and was frustrated to find that the electric start just spun and sometimes would catch briefly. The kickstart won't turn either, just stuck. I took off the alternator cover to see if i could turn it with a wrench and found that if i backed it up a few degrees i could turn it forward for a while before it would get stuck again. I'm really hoping the pistons aren't seized but i'm new to motorcycle engine repair and could really use any advice available. I'm really excited to get this thing started and have done a lot of reading on it, but am starting to think something is wrong. Any suggestions or responses would be awesome, if i think of/find any other symptoms i will post them. thanks in advance!