engine siezed

The top end is probably toast if you ran it without two stroke oil you will need to take the top end off and confirm what size piston you have and buy a top end kit that is the next usable size. Meaning what ever next size the cylinder will clean up at. Remember 68mm is the max bore size on the blaster without going to a big bore sleave or a standard resleave. make sure you use some oem gaskets or cometic brand gaskets.
 
just got blaster from dealers 2day and the engine has siezed he had filled bike with petrol but no oil !!!! what will it need

Your saying a dealer didn't mix oil with the gas? If that's the case, the dealer should be the one paying for the rebuild.
 
yeh he thought it had a 2stroke tank and filled with petrol but no oil he is picking up in morning to fix it still runs but the bike locked up so I going to get him to fix it