Hi Keito,if you have installed the rails properly and u sayed you turned the enging throu several times with no problems ,and than u probally cut out a link and installed the new chain with a master link and turned the engine throu by hand,and what happened that tohe engine does not turn throu is that the chain jumped a tooth or two,it always happens when you dont remove the spark plugs.(and even then the jump once in a while).So first thing u should do is slowly turn the engine backwarks very little so u have no tension on the chain..VERY LITTLER Bit. than u need to jump the chain one tooth forward or rearward.u will find out wich way the chain did jump.So i also hope u removed the chain tensioner when u started doing this work and that you fed the chain throu fom the right side of the engine #1 cylinder.if it works to get the engine turning again to finish the job.Make sure u check the chain timing after the job is done ,both camshafts and crank pulley.if u need more help let me know do u have a single chain or a double chain in it? Harald