Vt250 spada help required broken exhaust camshaft after cam chain replacement. Ran perfectly for 2 mins then dropped a cylinder. Shit down engine and rechecked timing. All spot on. Tried to restart and motor would not turn. Charged battery and turned over by hand. Tried to restart and bang with oil flowing quickly from front head. My question is would it be beneficial to replace the cam chain for that head again seems like only had 2 minutes of running or could it be damaged.